Revisions log for Answer #784

The reason is clear. The process began not in the December frosts, but a little earlier, when it was cold, wet snow, slush and high humidity. Facades are not covered and not protected from the effects of these factors, the panel in these conditions swelled, increased in size across the width and broke the glueing of the mullion-hinge. To fix it, you have to completely disassemble the doors, trim the panel and then try to fix the broken parts.