Fields keep getting set to 0

[RobinCirex]

Hey, I'm working on a custom entity right now and for some reason, every fields I have added keep switching between 0 and their actual value. For example it has the field "temperature" and when sysouting the value I get this

This isn't only for temperature

0.0
37.0
0.0
37.0
37.0
0.0
37.0
0.0

Does anyone know why this happens? I don't set it anywhere, except in the "readFromNBT" method but afaik that is only called on world spawn? 

Edited April 24, 2020 by RobinCirex

[Ugdhar]

Use the logger instead of sysout, and I bet you'll see one of them is the server thread, and one the render (client) thread