What's wrong with this 1D aim-offset?

Here everything looks normal:

Then I drag the preview thingy to the right and this happens:

The look CU settings (with “Selected Animation Frame”):

What could it be?

Hey there, check that for each aimoffset pose is set to mesh space and pointing to the CC anim, so CC points to itself, and U and D points to to CC. On the aimoffset use the idle as the preview base pose and that should be enough.