Sounds like you need to check your lines!
I've only ever flown Cabrinha and they are set up so all 4 lines should be the same length. My guess is that one of your centre lines is slightly longer than the other, possibly steering lines as well. It is also normal for the centre lines to stretch more than the steering lines because they hold most of the force.
This is the Cabrinha Tech Tip for tuning your bar, there may be something similar for your kite.
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Hope this helps