Incorrect payment checks sequence when run payment process request

Hi

I have a big issue on payables

When I executed the payment process request  from Payments Manager, this finish correct but the payments documents created was incorrect by the sequence.

Document Number

1960

1961

1962

1964

1965

1966

The document number 1963 was not created

When I find this document (1963) from SQL:

select *

from ap_checks_all

where check_number = '1963'

Not found anything

And when I try to do this payment manually for SANTANDER 6805 bank account, appear this message:

this paper document number has been used.

Some suggestion for resolvet this issue?

Any table or interface to find this document?

Thanks & Regards.