Hi dilyon,
When I hover over the first of those events I notice it points to an event taking place on February 27. Within the list of upcoming events on the front page, though, the date shows as February 20 — is the problem you are referring to?
If so, please note that this is not a widget that our own plugins generate. Might it be something your theme or another plugin provides? Is it possible it is using code that was designed for handling regular blog posts rather than events (are those dates actually the publication date rather than the event date)?
It could definitely be worth exploring this with your theme vendor/author of that particular component 🙂
Let me know how you get on!