Reported by IronParrot on an Elemental Shift runthrough. To replicate, start a game in the Elemental Shift Earthzone 1200 starting ship, and enhance one of the rheopectic armor segments. The HP will move out of the enhanced armor and into the non-enhanced ones, buffing them past 100% integrity. By spamming repairs on the enhanced segment, you can get the full set to 1HP below the max of the enhanced segment.
While a mechanic like this would actually be quite nice to formalise sometime, distributing armor should check the maxHP value for other armor before sending points across.