You need to speak with an inspector/structural engineer to determine this. Neither one of us can know the cause of such a defect.
As a Realtor I would run from this when there are so many other homes listed in this market. Why look for trouble?
Some of the new Home Loans can have piggy-back loans to repair the house before you move in.
It will depend on what you want to do; do you want the house?
This is not the worst problem that you could have with a house.
You could make an offer Contingent upon the Inspections, and after you have the Inspection, bring in a Contractor and have him give you an estimate. Then you can negotiate with the Sellers about who pays what; until you are happy, or, back out of the Contract if you are not happy.
Good luck and may God bless
it wasn't expensive and it was an easy fix. what happened after was some light cracking in the walls so we sanded and plasters and put up new paint it looks great and the flooring is fine.
This is only 1 example of what could be wrong. Please hire and inspector to make sure its not rotting beams or more.
All the Best
Dave & Lisa