London Flat sold for 22.5k - how can this be?

[simpsons1]

Just looking up an old neighbourhood, and saw two Abraham flats - sold in Francis Rd, Leyton from over 300k one year, to just 22.5k in 2021. Can’t see any fire damage, don’t think there would have been floods - even with repossession flats in London can’t be that cheap. Anyone know why it might be? (Address are 119 and 121 Francis Road, Leyton, E10)

Buying someone out, partially , I know someone this happened with and it shows in zoopla as the sold price but it was not, it was less than it was worth as it just changed hands, not a real sale.