When running the Pre-Check Report, the ShareGate migration tool displays the following message:
After running a Pre-Check Report, several issues can be found that would not necessarily prevent the copy of an item. For example, suppose the site template used by the site that you would like to copy cannot be found on your destination server. In that case, the ShareGate migration tool will automatically fall back on the default site template. Since you may find minor differences between your source and destination after the copy is complete, the app will flag it for you in the report so you can fix the issue before running your migration.
Note: Items listed under Other warnings will still be migrated when you attempt to perform the copy.
Since these warnings will not prevent the item from copying, there is no definitive solution. You can investigate these case-by-case and determine if steps should be taken to fix these issues before you start the migration. You can get more information by verifying your warnings in the Pre-Check Report.