Why the game is so low updating? my server is 32/32 but on gametracker they are 26/32.
How does it works this updating time?

Everyone who runs a Counter Strike server always makes the assumption their server has 32/32 players every second of every hour. Unfortunately this is rarely the case. Servers will naturally have inflows and outflows that cause it to temporarily go below 32. Also, at times like map changes, you'll find a surge in people leaving servers typically.

Thus, when gametracker averages the traffic over the past hour to list in the graph, it's rarely at 32.