Hello,
Since you are using the Full Header, the size of the Header is flexible and depends on the Browser Size, so the amount of Menu Items and the Logo size causes this issue as they exceed the available width. It is recommended to use Media Queries to decrease the Logo Size by CSS or decrease the Font Size and Padding for the Menu Items Text. Example:
[ch_pre type="css"].device-lg #logo img {
height: 70px;
margin-top: 15px;
margin-bottom: 15px;
}
.device-lg #primary-menu ul li > a {
padding-left: 12px;
padding-right: 12px;
font-size: 12px;
letter-spacing: 0px;
}[/ch_pre]
This should definitely work fine. You can change the Values above according to what suits you best. Hope this Helps!
Additionally, we recommend you to update to the Latest Version of Canvas as Support for Older Versions of Canvas only includes general queries related to the included features.
Let us know if we can help you with anything else or if you find any further issues.