If you have a reference to the prefab and you scale it, this will cause the precise behavior you see
Also, screenshots of code are useless and hard to reason about.
Instead please use code tags: Using code tags properly
I recommend liberally sprinkling Debug.Log() statements through your code to display information in realtime.
Doing this should help you answer these types of questions:
- is this code even running? which parts are running? how often does it run?
- what are the values of the variables involved? Are they initialized?
Knowing this information will help you reason about the behavior you are seeing.