Over here you can end up being part of a house buying chain
You put your house up for sale.
Then start looking for where you want to move to.
Then When your house is sold you then have the money to buy somewhere else.
You put bids in for the place you want to buy When you buy somewhere those people then
have the money to pay for somewhere else.
So the people who have bought yours are waiting for you to move out
You are waiting for the place you have bought to become vacant.
It's a chain, sometimes it can take months for the chain to move forward.
and. . . . .
If any members of that chain back out, for whatever reason then the whole chain can collapse.