SL determines the next check number by running a query on the module's document file (PRDoc or APDoc) looking for the highest check number already used that is not a manual check. So, if, at some time, you used a check number above your current check number (either as dummy check or you switched banks and restarted check numbers or you have cycled around) then you are basically stuck until the offending documents are removed. If they are very old documents you could purge history to get them out of the way.
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