Top menu wrapping

We have a site with a custom large image logo where the top menu bar is either wrapping around it down the RHS or if the logo is 980px it forces the menu off the screen entirely. The theme itself has not been edited but recently updated to v 2.2.4 but a site with 2.2.2 is not seeing this issue.

The site is not accessible live yet so I cant offer a URL but wondered if this is something seen elsewhere?

Any ideas?