The core idea
Markets can fall after a rate cut if investors interpret it as evidence that economic conditions are deteriorating faster than expected or if the future easing path disappoints expectations.
What is happening underneath
A cut can also coincide with widening credit spreads even as government yields fall.
How investors should read it
The reason for the policy move can matter more than the direction of the move itself.
The same market move can carry different information depending on which maturity, issuer and risk premium is changing. Read the question together with the underlying concepts rather than treating one price move as a universal signal.