Not a duplicate of Reputation change is not showing or Why does the reputation dropdown not show this upvote? because it is talking about the achievements updating.
Recently, I and Mithrandir reported a bug that the dropdown menu is not showing reputation changes.
This one is related to it.
The Communities section is not showing correct reputation too
In Meta SE, my reputation has changed to 311 but it is still on 308.
Also in the dropdown menu,
In SE for Android too
The reputation is up to date only in the profile -> reputation section and remaining all are broken