When changing yaw, the yaw can go negative

It seems like getYaw() does not return the yaw of the player, but the leftover of division by 360 of the total of all yaw changes since join

code used to test: https://hastebin.com/egegecegeg.java

results: https://www.youtube.com/watch?v=OWkzwgQKKQU

Example:
1. Player joins server, yaw is 90

2. Player makes 3 turns right(360 * 3 = 1080)

90+1080=1170

1170 % 360 = 90

getYaw() will return 90

3. Players makes 5 turns left(-360 * 5 = -1800)

1170+-1800= -630

-630 % 360 = -270

getYaw() will return -270, which should be 90 as that is the yaw the player has