Carry forward of non-used encumbrances posted in wrong period in GL

We're facing issues with the carry forward of the non-used encumbrances for several purchase requisitions.
While making carry forward of the non-used encumbrances from the year we're closing to the next year, everything is running ok in Purchasing.
However, encumbrances remain incorrect in GL as the reversal of the encumbrances was accounted in the first month of the next fiscal year (Jan-2018) instead of being posted in current accounting period (June-2017), which was the correct accounting period.

Status for encumbrance periods in GL is Open (in fact last encumbrance year opened is 2024).

Please, anyone knows about a similar issue and the solution to avoid the same issue in the future?