Are people doing this or am I going crazy?

Sometimes I’ll like an item on Depop but may not purchase right away because the item may cost too much at the moment. I get offers but sometimes I feel that the seller may rise the price and then discount it to its original price? For example, I liked a dress and saw it was $40. The buyer sent me an offer and the dress was $49 and the offer was now $40? Is this a thing? Sometimes I think I’m crazy lol because I could have sworn I saw the original price as something else. Maybe I should start taking screenshots as proof? lol