It's just weirdness with numeration. An extra chapter got promoted to main or something like that, and the numbers shifted, so there was a gap. The translators thought it's missing and translated it again.
It's just weirdness with numeration. An extra chapter got promoted to main or something like that, and the numbers shifted, so there was a gap. The translators thought it's missing and translated it again.
Here's what happened. In the magazine, it mistakenly went:
Chapter 10
Special Episode
Chapter 12,
thereby creating a missing Chapter 11, but actually, nothing is missing. The numbering was corrected for the volume. However, currently MangaDex is using the magazine numbering (at least partially). I will (get someone to) fix this shortly.