I have just discovered this same problem on my Macbook Pro running Catalina (as per my signature). I am setting this up as a 2nd machine using a copy of my Profile from my iMac (as per my signature) which has never had this issue.
I also posted in a thread regarding an issue with Hot Keys (HotKeys stopped working with an update of OBS) and included this as a possible related issue:
Not sure if this is a related issue, but the slides I'm trying to change with the Hot Keys will not display in the desired order. I'm pointing OBS at a directory and the files have sequential numbers in the title (eg. /TWT14 Slides - 01 & TWT14 Slides - 02). The folder is sorted by Name. Again this works fine on my iMac.