Chosen Solution

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

Check your preferences setting for your keyboard

If that doesn’t help you likely need a new keyboard assembly