If you’re in the same office you’re probably on the same IP address as far as the internet is concerned. AdRotate has a sort of timeout to not count multiple clicks from the same IP address.
This is to prevent stats from inflating too fast, but also to hinder click farms.
If Siteground has some kind of caching, that may interfere with stats collection as well. Some of such systems keep queries from running for example. Or don’t talk to PHP at all. Which prevents the stats code from running.
But, AdRotate (Pro) is compatible with Borlabs Cache and W3 Total Cache.