I have a single unit set on my Arena Defense.  Somehow this is giving me 100% win rate on defense.  I don't know what team these people are fighting but it sure as heck isn't the one I've set at defense.

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Now, before you go and say "maybe he's actually winning", just no.  This guy has 150 SPD, and I use him in an Arena Offsense team where I have to be very careful about who I battle otherwise I'll get crushed before I even have a chance to attack.  I don't know what this broken system is doing, but I can promise you that at least some of those people in my Defense log did not actually fight a single Big'Un.  What did they fight?   I have no idea, but it wasn't this guy.

If you're thinking "Maybe they just had your old defense team on their log and they hadn't refreshed yet", well this single Big'Un has been up for almost 2 weeks.

Also, please know that I've tried other units besides Big'Un and the results are always the same.

Here's the interesting part.  If I change my defense team to a single 3* or 4* unit, then suddenly all the people in my defense log get weaker, so I'm still winning.   What kind of messed up system is this that you can't even lose when you're actively trying to?