My Facebook KEEPS telling me that my pword is incorrect!?

Lately my Facebook has been giving me a lot of crap. I use Opera as a browsing option and usually stay logged into my Facebook 24/7. Lately thought when I try and log in it says the pword is incorrect. I have to then go and reset my pword which i have done over 10 times in the last 2 days. I reported it as being hacked but they said since I was able to gain access to it then all was fine. But this keeps happening even though I've made sure to not make typos when changing and typing the pword in. Can anyone help me? I've scanned my computer for viruses.