Search bag bugged

There is a bug with search box, I experience this on official Shapely demo page as well but it’s easier to see on my site with larger header. My site ->
If you move mouse above Press, Blog, About links on my site,(Area marked with red in this pic Imgur: The magic of the Internet) the search bar starts to appear/disappear and stutter.

I tried both Firefox and Chrome.

Hey there,

I hope you are well today and thank you for pointing that out.
I’ll notify the developer of this issue.

Best regards,