I have been getting this messages for some time and i recently decided to dig in and see what they mean. But could’t find any information… Guessing they mean an error happened while loading a map and it got fixed withing clinet?
And how do i disable them?
You do not disable them, you fix the underlying issue.
Grab yourself a copy of YMAP & YBN Mover, select Tools, Poly Edge Fixer, add your map folder, start the fix and restart your server, repeat for each custom map until they go away.
Edit : As to what they mean, something wrong with what was used to export the affected map assets from the original 3d modelling software most likely. You wanna fix those as they can lead to stutters on weak systems.
Okay, thank you very much!
And yeah i noticed the stutters, and this message popping up so i thought it was only me, thank you either way!
thank you for this <3 
(Shameless plug for further reading)