Transition on link not working html?

Hello,

I wrote a code that when I hover over the "Contact" link, it gets bigger and so on with a transition.

I did the same thing with the "About us" link next to it, but when I hover over it, both links suddenly pop up and spin.

Here are some pictures:

"Contact":

Everything works well here.

"About Us":

Here both left suddenly go crazy

Here is all the CSS code I have written so far:

Thanks:)