Board Thread:Questions and Answers/@comment-24058913-20131016192406/@comment-11051098-20131021194644

Probably just a mistake. You can see such things elsewhere in the anime too. People changing positions between scenes when they didn't move - body postures changing between quick shots - details disappear and re-appear... etc.

E.g. Nnoitra and Kenpachi's battle - Nnoitra's arms get thicker and slimmer, his wrist rings disappears and re-appears, cuts and wounds disappear as the fight progress, etc.

But I suppose it's to expect at least with minor details. It would be more work to keep drawing every detail in every pic.