[Urgent] Lost commits on remote repository

Hi,

On one of our repository (lajavaness/amc), the last commit dates back to october 25th yet we have pushed several commits since then. Everything was fine until yesterday afternoon (around 3pm), we were able to pull and retrieve our files as usual.
Bitbucket was unavailable on october 25th, could it be the reason why our commits are disappeared?
Thanks for your quick answer as this issue is clearly critical for us.

Vincent.