Font size has shrunk & I can't fix it!

The font size throughout my website has shrunk. There are large white spaces between categories where there should be none.

My website is http://www.WhichInvestmentTrust.com

The issue exists on different browsers and PC’s/tablet’s.

I use Themes by bavotasan.com Magazine Pro.

I’ve searched the forums here and most suggestions relate to browser sizing errors which dont apply to me. I’ve also tried selecting “wordpress should correct invalidly nested XHTML” and then suspending and then republishing all of my articles but that didnt work either.

Has anyone else come across this? Have you found a solution?

Many thanks, Dice