A cat's whiskers being too long means:
The longer a cat's whiskers, the wider its body is generally considered to be. Whiskers act as a "tool" for cats to measure width. When cats jump, climb, or crawl through holes, they use their whiskers to judge whether their bodies can fit inside. If owners trim their cat's whiskers for aesthetic reasons, it's actually very detrimental to the cat. It might cause the cat to get stuck when trying to navigate obstacles. 
Having a cat's whiskers cut can cause the following problems:
A cat's whiskers act as a measuring stick, helping it maintain balance and making it look more energetic when walking. Cutting off the whiskers is like taking away this measuring stick, causing the cat to lose its center of gravity and become unsteady when walking.
