Fako = FAKE credit score which is what both of those sites provide.

FICO = real credit score but their are many deviations of this and each bank chooses their own.

NYCRuss already explained a major difference between fake and real credit scores.

Mia explained how using up most of the credit limit on any card will also have a negative effect. This will be compounded if you only have a few cards and are building credit - and even seem more so if using FAKO websites for your credit score.

If your drop is mostly due to closing cards it is a non issue (since the banks are not using the FAKE score these sites provide). If it is due to a high balance (at any given time) the good news is that it gets cleared off and your credit/report score the following month once you pay off your card and your balance is low or 0, in this case your score will jump back up to where it was.

From my observations viewing my own credit report over both FAKO and Real sites, banks report out a snapshot balance once a month and from what I can see on my credit reports in mirrors my end of month statements.