In backlog: https://trello.com/c/88HtJH3S

2. it might be good to also understand what is causing this issue in the

first place

I think that the time difference displayed is calculated based on the browser/pc clock, which was/is/can be a bit off compared to the server one (providing the timestamp).
I just had that too, and based on a atom clock website, my clock is currently 25 seconds in the past, which would match, what I saw on my flow post.

I'm new here, so sorry for disturbing.
I've experienced the problem reported earlier.
In my opinion, trying to synchonize PC or to play with several clocks is a hard job. Maybe all the timestamps should be computed and converted to text server-side. Otherwise there's always a dependency on client's clock, which looks like a bad idea. As a proof : this bug exists and we are having a discussion about this problem.
My intuition is that a simple solution like an offset can lead to wrong information.
Sorry not to be more helpful.