it is because youtube and instagram BUFFERring. the buffer could last over 5 to 10 minutes.
if you use speed control to 75%, you can see some of the user buffer up to 100MB in less than 1 minute when use youtube. the speed / data view reports that.
if you can set your AP router into Bridge mode. it should work the same . do you want to try ? you need login into your router however. 🙂
anyway, mail me the order ID please. no worries.