Crease in upper lip - what is happening? (Photo)

I have had fillers for over 7 years in my lips. They’ve been migrated and I have gotten them dissolved a few times before. This last time I got half a syringe and then was pregnant and so I couldn’t dissolve at the time and they looked migrated. I have since had 5 rounds of dissolver. The first 4 were above the lip as we thought that was where the filler was but nothing improved. 5th time we dissolved in the actual lip and the indentation is not improving. What is happening? I’m in my 30s.