Lightroom classic masking tool not working, how to fix

[Tricia5EE1]

I have been having nothing but issues with lightroom lately. I am in the middle of editing a wedding gallery that HAS to go out. I basically had to keep recompute the masking (because it would reset itself automatically). So as a last ditch effort (after tech support couldn't figure it out), decided to just uninstall and install lightroom classic. Well... it fixed my original problem, but NOW my masks wont select properly. If I do subject select it basically selects half a subject and the background, Almost like one big mask across the image, rather than how it was pretty perfectly selecting people. 

PLEASE HELP ME FIX THIS. I am so stressed out trying to figure it out. 

Thank yall 

[cmgap]

Can you post a screen shot of the example in your post? Please include the masking panel open.

[johnrellis]

Also, please do the LR menu command Help > System Info and copy/paste the entire contents here so we can see exactly which versions of hardware and software LR thinks you're running.