Pages/posts showing in menu that don't exist

Hi

If you go to https://www.lutea.com.hk/about-lutea, you will see a side bar menu.

If we look at this in Firefox or Chrome, it is correct. If we look at it in IE, there are extra items such as Homework and essay related links.

THese pages don’t exist as they were all deleted months ago. We never added them in the first place.

When I look at the Menu in the admin area, these homework and essay related items are not in the menu either.

Does anyone have any ideas as to why IE is still showing them, and what can we do to get rid of them?

By the way, I created an identical menu, added one extra item and activated it. FireFox and Chrom show this correctly, IE still shows a dodgy menu WITHOUT the added item so it’s as if IE is looking at the site with an older version of the menu.

One last thing, my iPhone shows the dodgy menu as well.

Would be grateful for any help on this as it doesn’t make sense.

Cheers