Almost all human cells are programmed to remain in a specific place and to commit suicide if they discover they're misplaced. This way when things go a little bit wrong and a few cells are somewhere they shouldn't they just die, and there are more where those came from.
The lymph system's own cells deliberately lack this programming, they're part of the immune system and are supposed to wander about on their own. But these liver cells presumably don't think they're actually lymph cells, so they aren't entitled to just wander off.
https://en.wikipedia.org/wiki/Anoikis
The lymph system's own cells deliberately lack this programming, they're part of the immune system and are supposed to wander about on their own. But these liver cells presumably don't think they're actually lymph cells, so they aren't entitled to just wander off.