Thanks a lot for the report! We just released v1.4.1, which fixes a problem with the hashing that would sometimes return incorrect results when fetching all hashes for a dataset. A similar issue has been reported on this thread and I suspect the hashing problem might have been the cause of that. It’s also likely that the incorrect sample count you’ve come across had something to do with this.
Re deleting / unlinking examples: Because all examples are added to both the regular dataset and session dataset they’re always linked to at least two sets – potentially more, if you annotate the same examples more than once across sets. The way deleting and unlinking is currently handled isn’t 100% ideal, and we’re working on a better solution.