My keyboard prints random symbols

About 2 hours ago i replaced keyboard on my retina Macbook 12 2015. It looks pretty normal until i start typing on it. It keeps typing random symbols on it's own. Here's the example:
The quick broown fox jumps overo the lazy dog. The quick broown fox jumps over the lazy dog. rrrrrrrorroroororororororrorororrrrr rororrrr.

Now it does "r" and "o". I don't know what should i do! When i try to clear the cable using rubber it just simply change those two to other ones.
I'm using Mac OS Big Sur 11.4