@annika
I use #fedilab, a client with a button for fetching all replies to a post from the remote instance. Pressing this also fetches the number of boosts/likes.
For instance, at the moment I see your post has 1 boost/0 likes. Pressing the button I get 7/15. How does that match what you see?
It only gives the updated numbers for the original post, not for all the replies.