374823146340, I’m having the same problem as well for only a few projects. It’s hard to say if they were made using the same PPI account (as switch between work and personal RC accounts often), but I’m pretty sure they were all made with the same account.
Regardless, is it possible to open PPI projects with a different account? I know I can export the PPI license but AFAIK, you can only use the PPI license to start a whole new project with those photos, not actually open an RC project that’s in-progress.