Menu Wrap - Joomla! Forum - community, help and support

i've upgraded our church website use joomla. things work fine, there's 1 problem can't fathom:

quite frequently, when page loads, main menu (which horizontal) wrap around onto 2 lines.

the website @ http://www.holycrosshove.co.uk/. if can me understand why , how stop it, i'd grateful.

thanks
simon
www.beautilitydesign.co.uk

can give link page happening? i'm not seeing on first level links.