On Android's Data usage page or in your favorite data-traffic tracking app, you might see an indication that Adguard has consumed all or most of your mobile traffic.
Make no mistake - it's your apps and not Adguard that consumed the data in question. There is a known issue with Android when VPN or a proxy is established, with all traffic from all apps being assigned to Adguard.
We hope that this clarifies what's happening.