I got my new skates in January. After I heated the them I had what looks like exploding glue near the same seam and that section was bulged and separated from the skate. I contacted True since I was also concerned and they said the glue was not thermally active (incorrect in my opinion) and the seam/glue was cosmetic. I think they have issues with the glue at least in some cases. The skates were heated at a True reseller and it appeared that everything was done correctly.
I got rid of the bulging and the separation by heating the area with a hairdryer. Fixed it immediately.
That said, I now have at least 50 games on them ( I play a lot)and the area is no worse. Only major problem I have had was breaking a blade within a week in the area where the bolt holds it. True replaced it at no cost and the LHS profiled and sharpened them for free so the service was great. I believe there is a year warranty from Step on their steel.