Getting these in console:

[23-Feb-2020 02:15:34] [GriefPrevention] Removing entity ARMOR_STAND @ Location{world=CraftWorld{name=world},x=122.286,y=175.33,z=164.737,pitch=0.0,yaw=2.7653792}

[23-Feb-2020 02:16:34] [GriefPrevention] Removing entity ARMOR_STAND @ Location{world=CraftWorld{name=world},x=122.286,y=175.33,z=164.737,pitch=0.0,yaw=2.7653792}

[23-Feb-2020 02:16:34] [GriefPrevention] Removing entity ARMOR_STAND @ Location{world=CraftWorld{name=world},x=122.286,y=175.08,z=164.737,pitch=0.0,yaw=1.2511551}

[23-Feb-2020 02:17:34] [GriefPrevention] Removing entity ARMOR_STAND @ Location{world=CraftWorld{name=world},x=122.286,y=175.08,z=164.737,pitch=0.0,yaw=1.2511551}

These locations all have holograms, and this is how they look like when I teleport to them, like they are double:
https://i.gyazo.com/89740fec88ff6fe2fd28645640ae0262.png
https://i.gyazo.com/7d470fbc2f65497c42ecf2b75c5e8ca1.png

These are my versions:
https://i.gyazo.com/02e9aa1ed94be3193c5405a3a31a76fa.png

I tried and it doesn't create duplicate entities for me. It could be another plugin or some new problems related to duplicate entities in 1.15, can you try without GriefPrevention? I will try to add some debug commands to count the entities spawned by each hologram.

The spam in the console cannot be avoided, unless GriefPrevention ignores holograms using Holographic Displays' API.

I've added a /hd debug command in the dev builds: https://ci.codemc.io/job/filoghost/job/HolographicDisplays/lastSuccessfulBuild/

Please try to execute it and show the output.

I'm pretty sure it's the same issue in #260, I'm closing this one.