@KevinMcQuillen I don't think this problem can be specifically said only to NUX. I have experienced this problem occasionally in other applications too like MS Word, Excel, Edge browser, chrome browser, etc.. This could happen because of various reasons like many tabs are open and are loading something, or number of applications are kept open and not exited. Here is a link which Microsoft has put which could give you some description about this problem : The scroll bar continues to scroll after you release the mouse button (microsoft.com)
... View more