Uh you might want to describe what the bug would be, cuz the issue around it sounds more like I worded the mini game poorly in it than a bug, so if it end up being a real bug and not that I'd be unsure but for it just being my bad wording then,
If you click on the vial it'll apply that to the mixture so you make sure you only add each color to each one once, when asking if you want to add another it means to that bottle specifically, and saying no means to move onto the next beaker
If you need more info on which to put in I put the answers in the game file, there's it posted there or I can let you know here