The first and easiest one that you’re probably already doing: you gotta turn clock fully counter-clockwise
The second and a bit harder one: You may have bought it in a non-default setting. Check out the Options instructions: Unplug all CV inputs and hold the TAP/reset button for half a second to adjust Grids’ options. The switch stays illuminated. Hold the button again for half a second when you are done. Follow this reference card to know how to adjust the settings
Actually, re-reading your comment it sounds like you may have already tried that. For me, it’s been a while, but I remember I had to futz with every setting (not just PPQN) to make sure it was what I wanted before I was happy with it.
You can also go ask on the Mutable Instruments forum (e.g., this linked topic may be relevant). People there are quite helpful, including Émilie