Warning notice made by squaremap basically spammed each second, consistently telling the console about it not being able to write, this might be solved by starting the server as administrator but currently we do not want to do that while the server is up with player on. I don't get why it would want to change the settings file, afterall it is a settings file. All help is appreacieated. Sorry if I didn't follow any format, just wanted to get this out here!
[17:52:57 WARN]: [squaremap] Failed to write file 'plugins\squaremap\web\tiles\settings.json'
java.nio.file.AccessDeniedException: plugins\squaremap\web\tiles.753935793280151--1452149791-settings.json.tmp -> plugins\squaremap\web\tiles\settings.json
at sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:89) ~[?:?]
at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:103) ~[?:?]
at sun.nio.fs.WindowsFileCopy.move(WindowsFileCopy.java:317) ~[?:?]
at sun.nio.fs.WindowsFileSystemProvider.move(WindowsFileSystemProvider.java:293) ~[?:?]
at java.nio.file.Files.move(Files.java:1432) ~[?:?]
at xyz.jpenilla.squaremap.common.util.FileUtil.atomicMoveIfPossible(FileUtil.java:184) ~[squaremap-paper-mc1.18.2-1.1.3.jar:?]
at xyz.jpenilla.squaremap.common.util.FileUtil.atomicMove(FileUtil.java:152) ~[squaremap-paper-mc1.18.2-1.1.3.jar:?]
at xyz.jpenilla.squaremap.common.util.FileUtil.writeString(FileUtil.java:132) ~[squaremap-paper-mc1.18.2-1.1.3.jar:?]
at xyz.jpenilla.squaremap.common.util.FileUtil.lambda$writeStringAsync$7(FileUtil.java:120) ~[squaremap-paper-mc1.18.2-1.1.3.jar:?]
at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1395) ~[?:?]
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373) ~[?:?]
at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182) ~[?:?]
at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655) ~[?:?]
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622) ~[?:?]
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165) ~[?:?]
Suppressed: java.nio.file.AccessDeniedException: plugins\squaremap\web\tiles.753935793280151--1452149791-settings.json.tmp -> plugins\squaremap\web\tiles\settings.json
at sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:89) ~[?:?]
at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:103) ~[?:?]
at sun.nio.fs.WindowsFileCopy.move(WindowsFileCopy.java:317) ~[?:?]
at sun.nio.fs.WindowsFileSystemProvider.move(WindowsFileSystemProvider.java:293) ~[?:?]
at java.nio.file.Files.move(Files.java:1432) ~[?:?]
at xyz.jpenilla.squaremap.common.util.FileUtil.atomicMoveIfPossible(FileUtil.java:184) ~[squaremap-paper-mc1.18.2-1.1.3.jar:?]
at xyz.jpenilla.squaremap.common.util.FileUtil.atomicMove(FileUtil.java:161) ~[squaremap-paper-mc1.18.2-1.1.3.jar:?]
at xyz.jpenilla.squaremap.common.util.FileUtil.writeString(FileUtil.java:132) ~[squaremap-paper-mc1.18.2-1.1.3.jar:?]
at xyz.jpenilla.squaremap.common.util.FileUtil.lambda$writeStringAsync$7(FileUtil.java:120) ~[squaremap-paper-mc1.18.2-1.1.3.jar:?]
at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1395) ~[?:?]
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373) ~[?:?]
at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182) ~[?:?]
at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655) ~[?:?]
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622) ~[?:?]
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165) ~[?:?]
Suppressed: java.nio.file.AccessDeniedException: plugins\squaremap\web\tiles.753935793280151--1452149791-settings.json.tmp -> plugins\squaremap\web\tiles\settings.json
at sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:89) ~[?:?]
at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:103) ~[?:?]
at sun.nio.fs.WindowsFileCopy.move(WindowsFileCopy.java:317) ~[?:?]
at sun.nio.fs.WindowsFileSystemProvider.move(WindowsFileSystemProvider.java:293) ~[?:?]
at java.nio.file.Files.move(Files.java:1432) ~[?:?]
at xyz.jpenilla.squaremap.common.util.FileUtil.atomicMoveIfPossible(FileUtil.java:184) ~[squaremap-paper-mc1.18.2-1.1.3.jar:?]
at xyz.jpenilla.squaremap.common.util.FileUtil.atomicMove(FileUtil.java:161) ~[squaremap-paper-mc1.18.2-1.1.3.jar:?]
at xyz.jpenilla.squaremap.common.util.FileUtil.writeString(FileUtil.java:132) ~[squaremap-paper-mc1.18.2-1.1.3.jar:?]
at xyz.jpenilla.squaremap.common.util.FileUtil.lambda$writeStringAsync$7(FileUtil.java:120) ~[squaremap-paper-mc1.18.2-1.1.3.jar:?]
at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1395) ~[?:?]
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373) ~[?:?]
at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182) ~[?:?]
at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655) ~[?:?]
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622) ~[?:?]
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165) ~[?:?]

squaremap needs write access to the web directory. The plugin writes the settings for the web client to read. If you need to run the server as admin to have write to the web dir, then you have might have wider configuration issues, but really, just make the web dir writable by the user running the server with squaremap.