UPDATE:
I opened the Photos app on all devices to see if the continuous sync indication was still showing up at the bottom of the Library screen and it was gone. Someone at Apple cleared the sync message but the image count is still different betweeen different devices and I have no explanation why.
iCloud has the lowest count by 27 photos.
Mac and MacBook Pro both match each other with 27 more photos than iCloud.
iPhone 15 Pro Max has 1 additional photo than the Mac and MacBook Pro.
I have no idea why they're different. I'm not yet to the point where I feel I need to delete the library off each device and re-download from the cloud but I'm getting there. My Library is huge and downloading will cut into my monthly internet data plan which is 1.2TB from Comcast.
Before I do anything, I'd like to find a way to confirm what exactly is different between the different devices. Any ideas?