ok. I found your old post about that issue.
I also found this much older post that seems to contradict that theory and only indicates that there would be an issue if a user is not signed in and doesn’t have a row to reference.
But more experienced people agree that you can’t do it with Row Owners enabled.
So, I guess I’m not really sure. I’ve never used the Buy Button myself outside of some very brief testing to see how it works. The main thing I know about the buy button is that it can’t use computed columns. Beyond that, I have no idea what else is required for it to work correctly.
Anyway, have you tried moving your delete before any other action? I know it seems wrong, but it may be something to try.
I’m not finding it right now, but I seem to recall a post a while back that mentioned the pointer to the row getting lost sometimes depending on what actions your are doing. That theory doesn’t make sense though since your Set Column action still works. It may just be a bug with the Delete action since others have had issues too. You may want to submit a bug to https://glide-help.zendesk.com/hc/en-us/requests/new.