I've seen this a few times recently.
The first time I load the reputation tab, if there is reputation change today and yesterday on the same question, it (sometimes?) counts the today number wrong.
In fact, $290$ is exactly twice the total reputation value of the given answer, including yesterday's. The $143$ on the left is correct ($145$ for the answer, minus $2$ for a downvote on another answer.)
If I reload the page, I get the correct values.