summary field not working in cross app table to table relationship

I actually tried setting it up on a table within the same app and it still is not working. I'll double check all of the permissions but I think they are set up correctly. I think it must have something to do with the field itself. I'm going to try copying the data from that field to a new one and see if I can get that to summarize instead. It's weird because I am using dozens of summary fields in another app and I have never run into this problem before..