Ann: Investor Presentation - 2021 Annual General Meeting, page-8

Centrifuge wasn't separating materials correctly. Now it is, but I assume not at full capacity.

They are still in the ramp up phase. They are at a point where they could run the plant continuously and make SOP, but they won't be doing that. They have to start / stop and tweak things until everything is at full nameplate production.

This is all part of the ramp up. Ramp up stage doesn't end until March 2022, but it seems like they are well ahead of schedule.