mouse cursor not syncing in with the game

Playing on full screen is buggy. I was playing Hive Bedwars and its acting like I'm in a UI menu its really weird. I cannot put recordings in because it can only go up to 10 megabytes (I am using OBS) so I'm trying to rec my display but it cannot work, so the link is on the bottom of the description. I hope you can understand what I'm trying to say but its where the task bar if i look far enough down it pops up as the mouse is hovering over it, like its basically thinking I'm in a UI screen (e.g. chest, pause) when I'm not even in a UI screen. Really annoying.

https://www.youtube.com/watch?v=PIQW5qCYTNs