frozen items in menu bar

Hi, I created 2 new pages on my websites that I indexed on the menu bar exactly like the others. However once published, if you tick on the header and view one of these 2 pages, you cannot click anything else on the header (like home page etc…) it appears frozen. Looks like a glitch of the system to me or did I click on something that could have caused it??
my website is: www.creatingspacetherapies.com.au (pages Services and Special Offers have the same issue) Thanks