I have this weird problem, where my cursor just jumps over to the top left corner. It’s really annoying as I sometimes exit the program due to that. It happens when I am using the “value sliders” (I don’t know what they are called. It’s those things you can drag but you can also click on it and type in a number manually).
Thank you.
Howdy Lucan-san,
Thank for reporting this issue. This issue has been addressed via this AnswerHub post: Compiled editor: strange mouse behavior - Programming & Scripting - Unreal Engine Forums.
If any further information is needed, I would highly recommend commenting on that post so that it may be addressed further.
Thanks and have a great day!
Hey Sean! Thank you!
You are the third person this month to call me Lucan! Heh.
Well, thank you very much. I am happy to see that I am not the only one with the problem. I have been fiddling with my Mouse Settings but nothing helped.
Sorry about that Lucas. lol. I made sure to get it right that time.
Hehehe! It’s okay! 
And thank you! Have a nice day! I love Unreal Engine! 
And the people around here are very kind to me! 