Underrail minimizes if I click on the corners of the screen?

[nossr50]

When playing underrail in the top left and top right corner of my screen I see white little blips, if I bring my mouse cursor there it shows a windows mouse cursor instead of the underrail one, if I left click it alt-tabs my game.

Any way to fix this?

Also when starting the game underrail occupies a corner of my screen and it doesn't let me fullscreen it unless I click it and alt tab it a few times.

This is what it looks like when I start underrail https://imgur.com/a/k3tgc

I think its related to the first bug I mentioned, my friend has this problem too.