Check your syncronisation status on both devices
FAQ: How can I check the sync status?
Have both uploaded / downloaded everything and are the numbers the same?
I think you let the phone go into sleep mode?
FAQ: Not all notes, folders, or tags are displayed on the mobile app
Yes, each device has its own logs and must be accessed on the device.
Desktop: ~\.config\joplin-desktop\log.txt
Mobile: Configuration > EXPORT DEBUG REPORT
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