The numbers you circled in red are the number of tablebase hits.
Houdini is evaluating a position and periodically checking the tablebases, to see if it can find a forced win. It currenly gives White a big edge, 3.88, but hasn't yet found a forced win, loss, or draw.
Perhaps I do not undersand tablebases as much as I thought. There is an article by Peter Silver where he is talking about the new 6 man syzygy tablebases and he shows this picture of the analysis pane. If I understand the analysis correct the last line of analysis is scored as +-(3.88).
I thought that the whole idea of the table base was to perfectly play that position. Wouldn't each position then be either a win loss or draw? Which is the case with the 3-4-5 tablebases.

thank you,
John