Thank you for posting baout this @IiWillsmith and welcome to the forum.
Whenever any app is reacting badly to PopClip, the best thing to do is add it to PopClip’s Excluded Apps List
This should prevent any problems in that app.
Even when excluded, you can still use PopClip in that app by activating PopClip with its keyboard shortcut.
Re. Arc specifcally: For me, Arc sees to work fine alongside PopClip in Arc and I think(?) it does for many other users. I dont know what is causing the instability in some cases. (Perhaps it might be due to using certain Arc plugins?)
I would like to invite Arc users to comment on their own experience using it with PopClip, so as to build a picture of the situation.