0.15.12 Problems with uranium processing

[Hank_Bellfounder]

The centrifuges are only producing U-238, but no U-235. With the ratio 0.7/99.3 there must be 1 U-235 per ~130 U-238. My centrifuge doesn't produce any U-235 at all.

I used productivity 3 modules. A short time after rejecting them, i produced my first U-235's. Does it really depend on the productivity 3 modules?