If you're going to make a mini-app and don't want to support certain values just don't make them possible rather than have buggy/wrong behavior.
If at least both refused to update it would be a little better than now where one of the prices can update with the other staying the same and thereby throwing the comparison completely out of whack.
It refuses to update if it'll cost you over 100k in fees. Try an average transaction size of 3$ and a total monthly volume of 1,000,000$ for example.
If you're going to provide a slider with only a few pre-set values you should at least support all its combinations.