I can confirm that extension conflicts is most certainly a thing, and it happens to a lot of people. You haven't posted your full list of extensions for us to see. However, using logical deductive reasoning, we can assume, you have all the ones that come with Zorin at the very least, and the DPT extension could be conflicted with any number of them.
Like I've said in the past on here, I like to use Dash To Panel extension on POP OS. But in order for that extension to work, I had to disable POPS Cosmic extension. This is because the two were conflicting with each other. So that may be what is going on here.
Aravisian's suggestion to turn em all off, turn on your DPT, then turn on each extension after that, till you find the extension that breaks it, is a wise choice. Eventually, your gonna find it, and when you do, your going to say, "you have failed me for the last time, forever off you shall be"






