Thanks for your responses!
I am attaching another picture showing this issue which skewed prints. All the prints are always skewed in the same way.
You can see that the walls across the line number 1. are stretched, they do not follow a circular shape, hence, the section is thicker where the line crosses the print. The walls across the 2nd line are just fine. For a bigger print this results in two splits across the first line if circles are being printed.
I am not sure how this could be related to underextrustion or the flow rate.
Thanks!