Thank you for pointing out the problem! It’s fixed now.
Just as an fyi, the problem had to do with non-principal events. A non-principal event is an event about another person, but where this person participated. For example, in the birth of a child, the child is principal, and the parents are not principals, so the birth of a child may appear as a non-principal event on the parents’ timelines.
The problem stemmed from cases where non-principal events were associated with deceased people, but the principal was still living. In order to avoid this issue going forward, if you aren’t logged in, or are looking at a tree you haven’t been invited to, all non-principal events occurring in the last 110 years are now removed from deceased people. This will also remove recent (in the last 110 years) non-principal events where the principal is deceased, but in that case those events still show up on the deceased principal’s timeline.