Hey mamamia.
Found the bug - it was a really obscure one for sure. Don't think I'd have found it without the repro case. Sent you a patch, and as usual this will be in the next release.
To anyone else having the same issue, you should just set scale to 1,1,1 to fix it.
If the sprite collection has "Use tk2dCamera" set
AND
you''re displaying it on a tk2dCamera...
the scale should always be 1,1,1 unless you want to display it larger or smaller than it should be.