I report the problem here but I'm not sure if the problem is with Bitbucket Cloud or SourceTree...
I'm still trying to figure out why but I have just done another clone (with sourcetree) and last hour edits are not visibles (before that it was a full month off).
Things where looking fine before but it started to get mixed up when I tried to add image in the repository while editing text via the web.
At some point, the local cloned version started to desynchronized (trying to get master was without effect).
At first I tought it was a conflict because my repos was named something like myrepo-wiki, so the clone is myrepo-wiki/wiki. It was not conclusive but maybe it could be a source of conflict?