I've had modules like that and they were fine when reassembledam I screwed?
In the past when I was storing Leaf modules I would typically create a pile of ten and use their own weight to minimise 'bulging'. I would rotate the members within the pile once a week so that the top module became the bottom. I did this simply because I found it much easier to assemble packs when the modules weren't bulging.
I would suggest putting them in piles and rotating the members for a couple of weeks and assuming the bulging improves assemble them into your new packs at the correct pressure. As a precaution I would also suggest you keep the modules away from the house and check temperatures on a regular basis just incase something else is going on.
That said 4.03V is ~85% SOC so I think you're ok.