Is it legal for them to sell our mortgage four times after we filed bankruptcy on it?

We were 2 payments behind on our home and unfortunately signed it over to a scammer. We received a Lis Pendes that the house we moved out of went into foreclosure. We filed bankruptcy including that home and it was discharged in 2008. We bought a home in 2012 and got an FHA loan with no problem. This year, we have decided our home is too big and we are selling only to find out we cannot buy because now 6 years later the banks FINALLY changed the title of the original home out of our name so we can buy again for 3 years FHA and 7 years conventional. We are told we only got a new mortgage last year because we slipped through the cracks! We do have a lawsuit against the lender for placing it on our credit reports this year because we are protected by our BR but because the title was just switched out of our name in February 2013, we can't buy, even with excellent credit, something has to give!! We could have lived in or rented out the original house since 2008 and saved about $90,000 that we have spent paying mortgage payments/rent!! This can't be legal!