Spotify leaks over to second monitor

[IllidanSR]

It seems to happen when I use the windows "snap" feature but do so while some of the window's still on the primary monitor, here's a gif : https://gfycat.com/DaringWickedBeardeddragon

As you can see I've also included a small portion of my primary monitor (to the right) and I push the window to snap the first time it's not touching the primary monitor at all.

On the second time it does and you can see that some of the window leaks over to the other monitor