Oups sorry I was completely wrong I retest after testing GDevelop a bit and not understanding what the problem was because it really don't do the hitbox check the wrong way even with Ignore object that are touching set to yes.
Now after rereading your response I'am sure you don't decrease the number if i remove the object I test it by doing the valid recipe and putting the tea bag back in the shelf and my score increase but if you miss reclick to move the object it's already counted and you get too high of a number
and by dropping the water 1 time and 2 time and 3 time i get water + magma + violet tea valid
so water is 1 magma 2 violet 3