If you use Thaya Kareeson’s BuySellAds WordPress plugin, turn off the caching feature! To do so, set the JavaScript cache time setting to zero.
This is because Buy Sell Ads network is now also tracking the number of times the ads themselves get requested (not just the tracking pixel). If the ads are cached on your server, then they are not going to count in your Buy Sell Ads statistics whenever it is being displayed (lowering your impression count).
The caching mechanism is being taken out currently, but in the meantime you should simply disable it.
