Changing variable font origin completely changes weight

Glyphs
1

Hello, I noticed something very odd.

image
Designed Semibold weight, as it appears in Glyphs. Axis Location (wght): 600.

Variable Font Origin not changed (=first master is used):

image
image740×376 24.6 KB

Variable Font Origin changed (second of four master is used):

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image736×406 24.5 KB

Any reason why this would happen?

2

Any axes location or mapping?

3

Yes. I have Axis Location parameters set in all masters (and instances).

4

Can you disable them to see if that makes a difference?