Have I been accidentally making increases? First time doing linked dc in the round.

I'm probably increasing my accident when I join the rounds, but I just want to check.

The ribbing is a straight just tube and then I've put stitches all around the top of it so I can build a top. It's meant to be a bit wider but I wasn't expecting it to be this wide. Is this because I'm making accidental increases, or could there be any other cause?