multi grind size dosing puck prep

I’ve been having the best shots lately. I usually use my OE Lido OG, but recently modded an Encore with the M2 burrs and calibrated it to fine, I also removed the little lock button and made it stepless, but there is a slight bug with my conversion that has turned into a feature. The hopper doesnt stay in the same position, it slowly moves coarser as it grinds, about half a clicks worth per 18g.

Has anyone had this happen, I’m really enjoying this multigrind dose. Im using a cafelat robot and swroasting lychee beans. I preheat my portafilter on the kettle, shakey shake distribution, spin tamp with a tiny bubble-level on top, paper filter and screen on top. i do a high pour and put it in, hit the timer and press hard to 12 bars then ease it to 6 for the rest of the shot, usually a 1:3 in under 20s. Love them light roast fruity floral turbos with little crema.

Any theories? Has anyone else found this true for themselves?