VIP/Style Tab/Equipment affecting hot spring function?

No, I did not, I went to both the muscle loss AND the weight loss hotsprings.

Update: My character somehow got glitched fat. I sat naked in the weight loss hotspring for around four hours and didn't lose any weight.

Here are a few circumstances surrounding the instance: A.) I was using a dreamcatcher to change into NPCs and various mobs frequently right after eating. B.) I ate the food in my homestead, and I didn't get fat until I left the homestead. C.) I almost always have equips in every available slot, including cupid wings in my style tab.

I'm not sure what would be affecting it then. I have never really ran into either of those problems.

Were you in your homestead a full tick after eating the food? Weight changes are applied every five minutes since the server restart, sometime before a server goes off maint.