I often find that my mobile is slightly out when watching matches.

I've done it before where my mate has been playing a game on PC/Laptop and I've gone on my phone to support him and his game is ahead of mine. Its not normally by a big distance, sometimes only 10/15 seconds or so, but if you are bidding in the last seconds of a round then those 10 seconds could be what is hurting you.

Sadly I don't think changing the time on your phone will help matters either, it looks more like its a lag with connectivity.