Page scrolling up and down by itself

Hi,

I’m looking for a help with my specific problem. Maybe someone else had this before? I’ve instaled Enigma theme on client server and then begin to edit it. I’ve changed some parts of page code (for eg. order of displaying it’s parts) but I didn’t play with javascript.
Everything is working fine except one thing – page content (only on main dynamic page) keep’s scrolling up and down by itself.
It’s stay in one place for about 5 second and then jump up (for about 8 paragraphs), stay there for a while, and scroll’s down. And then again…

I will be very glad if someone colud help.