The 15 Years MCC event server has some sync problems with the client [FR screenshots]

I realized there's a couple of sync problems (I put it under Bedrock Server because idk where to put it otherwise and for the version I took the only one available in the search bar)

1. There is the problem on the image (sorry it's in French, I live near Paris) that makes half the people pink and gets a negative timer to the tp (I had the inventory opened and the text saying "game starts in about 3 minutes or less left" before opening it when this happened)
2. For some reason when I stop moving it takes time to stop (the more I keep the key pressed the longer it takes to stop):
   • ~1 second pressed => ~.5 second to stop
   • ~10 seconds pressed => ~1 second to stop
   • ~15 seconds pressed => ~3 seconds to stop
   • ~60 seconds pressed => ~30 seconds to stop

This was put private because of personal information.