Heey, thank you a lot for such a detailed comment!
The movement factor is quite crucial because the mechanic scales based on the player's perspective through the glass. In other words, the closer you get, the bigger the object appears. :D
Just wanted to clarify so you have a better idea vision!
According to the 3rd level, you need to shrink the bush first to be able to enlarge the plank, so maybe that was the case? Otherwise, if it's something else, thank you for letting us know! And for the feedback in general. :)