PvP problem?

Hi, well, i enabled the PvP in tweeria some days ago (the day next to the big update i think) and tried it, tweeted a lot, and in fact, won a lot of battles and also the first two PvP related achievements (which now dissapeared??) and just about some minutes ago i did the same thing, and i lost every battle, which i think would be perfectly normal if my rivals were strong and such...

but some were level 3 sleeping heroes?!

i don't know if it's a bug or not, but it looks like it and it's truly outrageous.