Thanks for the project ZIP.
You are missing Q_06.png
. Since you only have 30 of the 31 images (0-30 inclusive), Spine uses the first 30 images and the last one is missing.
It's a little deceiving that the missing image shows up last rather than at the position of the missing image. We'll see about changing that! At runtime the missing image will appear at sequence image 6, so the editor should probably do the same.
BTW, I noticed if you try to do an export you get a warning telling you exactly which image file is missing:
Image for attachment [region: Q_, skeleton: royal_Q, slot: royal_grad] not found: Q_06