Facebook Ads Price ?

Hello Friends How are you?

i used facebook ads last two days to promote a CPA offer using landing page and domain name of course, i setup everything to make my offer looks Great and convert well, i was target traffic who interested on making money online and working from home and home that kind of traffic because i have an offer that teach people how to build a home business and start making cash from home and stuff like that,

anyway i start creating my facebook campaign,
i target USA traffic
i put everything that i need for my campaign optimized picture and and and
i put people interest and ages
when i come to price form where i should put daily price i put there $50 per day,
i select optimize for clicks and i select manually price i put the price per click by myself, Facebook was suggest $0.30 to .80 for me i select $0.55 and then i submit the ad

i was waiting for some moment and when i check the ad i found that it reach 487 one and i got 6 Clicks

Goes What! the one click cost me $2.46 ???

What does that mean ?? i still can't understand what's happened ??

even i select the price of $0.55 per click but they cost $2.46 per click
i got 6 Clicks for $14.76 ???

Please can you explain what is that ?