Did the guy that made the repairs for you use a heat gun or heat lamp to try to get the patch to kick faster? It kind of looks like someone was using that technique and wasn't paying attention to where it was pointing...as if they heated up the patch to the temperature they wanted and when they moved the heat source away it was still close enough to heat up the boat and was pointing in the direction of your new problem area...which just so happens to be in-between the new repairs that they did. I doubt very seriously if it was a chemical reaction with the foam…it looks to be some low level of heat distortion. Not as much as Jake experienced...but enough to make it deform.

Regards,
Bob