Yes, you are doing a query that gets all posts of the post type ‘projekt’ and you are looping over these posts so you will show every post, then for every post you are showing every row of the ‘proj-repeater_ocakavania’ repeater.
If this is not what you want to do then you’ll need to explain what you want to do instead.
What template is this in? Is the query to get all of the posts necessary? If this template is already showing the current post then just eliminate the query and the loop over the posts so that you’re just doing the have_rows() loop.