U.K. banks raising mortgage interest rates…cause inflation hasn’t fallen as much as expected. Can anyone do an ELI5 as to why? - eviltoast

As the title says, numerous banks in the U.K., maybe across the world, are raising interest rates on mortgages, and the given reason is cause inflation hasn’t fallen as much as expected. Can anyone give me a basic inflation, other than greed, as to why they’d do this?