Sounds like reconciling the financial year will help (Microsoft Dynamics GP > Tools > Utilities > Financial > Reconcile). MAKE SURE YOU ARE KEEPING HISTORY BEFORE ATTEMPTING THIS.
My initial thought with your older GP version was to check that all the GL batches are posted but since you are seeing it in the GL Detail but not the GL Summary, it sounds more like things are out of sync between Summary/Detail. (Since voids don't go in batches, in older versions of GP, they always stop at the GL and require user-intervention to post to the GL.)
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