I have the same distortion on my Bigfootwindows. The stickers show that the windows were made by Sun-View in Summerland, BC. Perhaps they sell replacement seals? Please post if you find a fix. Thanks.
Sunview thought I could try silicone and a rag but suggested against heat. Thought that could make worse.
Too hot right now to try but will. If you do, let me know how it came out.