[Bug]Dual monitor and full screen mode switches to window when entering second monitor with cursor

[KungFury]

Since today I have this problem. I played Hunt since EA and never had this problem. When my (invisible) cursor enters my second monitor, Hunt begins to run in background mode and does not react to my controls. I then need to enter the primary monitor with a click first to give orders.
Tested full screen, borderless and borderless windowed mode but it does not help.

How can I fix this issue. I always played like this but after some weeks of pause from Hunt this happens :(.