Hi there , this is probably not issue causing your theme since your theme is best builder in the markets.
I. think i messed something in our sites mobile version since it loads double menubar when scrolling down. I use sticky header. Can you help me please since i dont find what i messed up with header. it. works perfectly in desktop, tablet version but mobile version loads two bars. so i have messed up something 
www.radiogramofoni.fi
Thx allready for the best theme availeble and superb support.