No scroll bars using my themes

1. 2018-11-19 at 2:32 AM UTC

   #1
   

   SBTlauien African Astronaut
   For some reason, I don't have scrollbars when using custom themes that I downloaded from DeviantArt. In the past, I have always have scrollbars but now they are missing from most windows. The only themes that have scrollbars are the themes that come preinstalled.
   
   I'm running Ubuntu 18.04 and using Unity.
   
   I tried messing with the scrollbar tools in Unity Tweak Tool but they are still missing. It's as if I have turned them off, but I have no idea what I did...