What's the practive with most shared host, do they count the ajax calls to the does ajax entry processes? Infact what other than php scripts executing counts towards them? I'm hitting that limit on a shared host that has it set to 25 with just 10 users playing a game.
A new HTTP request for CGI/PHP, when new SSH session is created, or when new cron job is started are all counted as Entry Processes. So you more than likely have something else creating them in the background, such as cron jobs, etc.