I have the same problem as described here:
https://community.acer.com/en/discussion/480954/z271-strange-issue-with-144hz ...
...and in many other threads. Screen gets a blue and yellow tint in various places in different games. Always happens after a few minutes, not immediately. Only solution is to unplug the monitor and plug it back in. For some games, that helps permanently as long as you don't alt-tab out to Windows. For other games, the problem comes back after a few minutes.
This problem has been reported over the past two years in different forums, including this one - is there really no solution from Acer for this yet??