Misunderstood ia when you thought you understood something but accidentally did not. Disunderstood is when you understood something but pretend that you didn’t.

Missinformation is when someone publishes information that is incorrect due to a mistake, such as believing outdated or retracted research, disinformation is when you publish information that you know is false with the intention of deceit.

In both cases the information is false, the only difference would be the intention of the publisher.