Attached is a video of it fully happening,
I set my guild logo for the very first time, and I was curious on what the cost was when changed it from there so I go in and I look and read it to see if it tells me, it didn't so I clicked no then I clicked on the logo I ALREADY had set and clicked apply, but if you pay attention to the chat it charged me even though I never changed it?
https://www.youtube.com/watch?v=O5v4t2N_Gm8