Symbols acting strange on iPad when tapped!!!

Hi there,

I'm messing around creating some web/learning apps but really just seeing what's possible.

When previewing the the project, when tapping on some fo the graphics to show the text, the image seems to 'pop out' or distort for a second or 2 and I can't figure out why?

Here's a screen shot from the ipad - see the 4th icon

Is it the way I've created it? It only behaves this way on the iPad!!

Here's the URL if you'd like to see what I mean

Has anyone come across this before?

As always, thanks for helping,

Stu