My numbers don't match across devices

Each phone keeps its own record, so two phones show different numbers. Settings has a Sync screen, but sync isn't available yet, so nothing brings them together on its own.

Bring them together with a backup

On the phone with the record you want, go to Settings, then Backup & Restore. Back up to your account if you're signed in, or export a JSON file. On the other phone, restore that backup from the same screen.

A restore replaces the local data the backup covers, so export the other phone's data first if you want to keep it.

Pick one phone as the source

Choose the phone with the most recent sessions. Avoid logging on both until you've restored, or the same lift will carry two different histories.

See Use Grain Gym on more than one device for the steps.