I don't know if you've already got your answer or not. I had the same thing happen to two bottles of the "older variety" so I decied to email
dermabolics. I was vague when explaining the product in question for fear of not having my question answered, but he said that while being stored in heat they "dent in" and should return to normal once opened. He said this won't effect the performance and made no note of needing to take any extra precautions such as smaller doses (although I didnt ask if I should).
Good luck