Sidebar/Menu dissapears after resizing on desktop

There is no issue on mobile devices, the responsive version works just fine.
It is simply only an issue on desktop computers where the sidebar is shown directly without a “show sidebar” link.

So in short, initial page load it shows the sidebar just fine, only once you resize the page up to a certain size where it becomes responsive and hides the sidebar under the “show sidebar” link is when it does not come back again after resizing to full size desktop size. Basically what then happends is the “show sidebar” link dissapears but the sidebar doesn’t show up so the only way to navigate in the sidebar is to resize it back to responsive again to see the “show sidebar” link again.

I made a small video to show you what i mean;

I don’t really understand what you are saying friend.

I cannot get this “bug” to show on a mobile device because it will never ever show the sidebar due to responsiveness, therefore, the mobile devices aren’t any issue at all, why would i try to trigger this to show on a mobile device if these aren’t the issue?

The video i sent is from a real time device (desktop) and only the desktop devices seem to have this issue.
Saying resizing isn’t a standard way doesn’t really help at all. We have tried and used so much themes and this is the first theme that gives us this issue where the sidebar just stays away forever untill the page has been refreshed.

We determined the error quite obviously, can you at least guide us to a possible setting that is perhaps set wrong?