My mouse alt-tabs CS:GO dual-screen Bug

[FateChanger]

''After the steam said me that they dont support dual screen monitor setup i decided to make a post here'' So my problem is that when i play Counter Strike GO and make a quick move mouse goes to second screen and alt-tab it i always had the same setup and specs of pc nothing changed so propably a game update fcked this. I always play windowed borderless so i can alt-tab games fast but when this happened i tried making it fullscreen but the same problem happens and even worst cause it goes me to desktop and makes like 1 min to go back to game but when i have it windowed borderless just mouse goes to desktop without alt tabing it i 0lay other game s from steam and from blizzard like overwatch/hots but this happens only in csgo anybody has any idea? Thank you for your time