[Northern]

Hopefully you just tweaked something and in a few days your back should be better. Sounds like your form was off and caused this problem, maybe lifting with your lower back. Your row is really high in comparison to you other lifts, perhaps this is a sign that your form is not perfect. In the off time study the lift, watch as many videos as you can, in another log I posted a link with some good videos.

Your squat has really improved in the last couple of weeks. You improved so much you have probably stalled. I would keep the weight steady and concentrate on form for another week or until you can manage the lift without leaning. Or if you need to deload and attack the plateau.