Blister pocket swelling problem

This is regarding Cefuroxime Axetil + Clavulanic acid tablet packed in Alu-Alu blister pack. On retention, it is observed that, blister pocket become swollen. It is noted that, as it is a moisture sensitive product, the blister pack is further packed in an Alu sachet. But the problem not resolved. Is any suggestion please what will be the measure to resolve it ?