View mode slides shrink in HTML5

Hi guys

after inserting recorded screens as step-by-step view mode in SL2 and viewing it as HTML5 output, recorded slides shrink for a sec or two with every step of a process. Did someone encounter this strange issue before? 

I've double checked, there are no animations applied. Flash version works fine.

Here's a link to a sample.

It's very important for us to find a solution. Any help will be much appreciated.

Thanks!