If you try to change the value by deleting the current value, the jellyfish vanish & do not come back even after typing a new value. I have to add digits in fr

If you try to change the value by deleting the current value, the jellyfish vanish & do not come back even after typing a new value. I have to add digits in front of the current value before deleting the existing digits, so that the field stays populated at all times, or the whole thing breaks. FYI. Also if you put a really high speed, they sometimes swim off the screen & never return, even when lowering the speed. Pretty amusing.