Issue with the manage payment documents

We setup a bank account and gave 753 as the first available document number in manage payment  documents page

When trying to make a payment the cheque number is showing as 754 rather than 753

I went to the bank setup to check for the first available doc number, it is showing as 753 and also in last issued document number it is showing as 753.

I tried to query in payments screen for that check number but no results are retrieved

Is this check reserved some where?

Is there any way can I track the document number?

 

Thanks

Dilip