Thanks for playing. I think you are talking about the image in the crafting section. Yes the image occupies the entire slot just displaying what you have crafted. Unless i am misunderstanding what you meant though.
This is how its supposed to look. 
130 days ago(+1)
Ah, thanks for pointing this out! Looks like when a combo fails, the placeholder icon grows just a little each time — and after 15-20 fails it becomes a giant boss sprite or can consider this as feature for now😂. Doesn’t break the game, but I’ll patch it in the post-jam update. Appreciate you catching this!