On my left joycon on the side (see picture) you can push in the plastic a little, which also makes noises. Can you get that away?
These are fakes
No, they were included with the original switch
Then get new ones
Is there no way to repair them or do I have to buy new ones for 70 euro now?
Yes you can
And how?
There are enough tutorials especially if you can speak english (what you should know)