This is expected and appropriate behavior in situations where activity broken up by fiscal period has both debit and credit entries. For the full year, there is only a single entry, either a debit or a credit, but if you report period by period, some periods have debits and others have credits.
For instance, if you have a 5-4-4 calendar, you have four periods in the year when no rent payment is made. In those periods, the current liability increases, because interest is added back to the principal balance. This results in credits to current liability. When rent is paid, the current liability decreases (debits). When we run a report for the entire year, though, we don't record the reductions and increases separately; we just report the full-year summation, which is a debit. So the sum of debits or credits for each period separately will be different than the full year debit or credit, but the combined result (debits minus credits) will match between full year and individual period reports.