% Complete Column Only Works for Some Parent Tasks

I created a basic project sheet and have been filling in tasks for two main deliverables (both shown as parent rows). Under those two parent rows are several child rows. However, the % Complete column is only auto-calculating for one of those two parent rows. The other remains at 0% no matter what I put in the various child rows. My project settings are set appropriately I believe so I'm not sure why this would be happening? And why it's working on one of my parent rows but not the other? Thanks for any help!