the version I get recommended by modrinth is NEOFORGE 1.0.3 which tells me I need to update to 1.21.4 - 1.22

-- Mod loading issue for: imfast --
Details:
Mod file: /C:/Users/{COMPUTER_USERNAME}/AppData/Roaming/ModrinthApp/profiles/craren/mods/imfast-NEOFORGE-1.21.4-1.0.3.jar
Failure message: Mod imfast requires minecraft 1.21.4 or above, and below 1.22
Currently, minecraft is 1.21.1
Mod version: 1.0.3
Mod issues URL: <No issues URL found>
Exception message: <No associated exception found>

the versions that were appearing were wrong, I've already fixed them

versions 1.0.3 and 1.0.2 are the same but 1.0.3 had an error in build.gradle that 1.0.2 did not have, they worked the same way

you can look at the error at issue #3

using 1.0.2 seems to work fine, please remove 1.0.3 from being valid for 1.21.3 and below on modrinth