Change identifier from iOS to MacOS?

On the dev web site I somehow have the Identifier platform of two of my Mac apps set to iOS when it should be for Mac, and now I can't select "Automatically manage signing" for projects within Xcode as it creates with errors. There are two similar Bundle IDs that have this issue: "com.modesittsoftware.GPX-Editor" and "com.modesittsoftware.GPXViewer". They both have the identifier platform as iOS. How can I change it to MacOS? The respective Mac apps are GPX Editor and GPX Viewer, both on sale at the Mac App Store. I can't delete the identity because I get an error stating they're already in use. I tried many other Xcode options such as manual code signing, but the app crashes with a code signing error, so I'm assuming the issue is the wrong platform as stated above. My question is: how do I change the dev web site app identifier platform from iOS to MacOS? Thanks!