Strange behavior in Firefox and IE

Hello!
I have quite a bit problem that appeared from nowhere few days ago. I have 2 separate modules on my page - one on main site and another on menu item TV.
My website is: http://tygodniowa.pl/
Image show works great i Chrome - intro text appears, there's an arrow on the right of the module.
In Firefox there's no intro text, no arrow on the right, title is in diffirent font and there is a read more button that's not working and that shouldn't even be there in the first place.
In IE there's no problem with font and etc. but Image Show randomly decides to work. Once you load the page and it works and next time it doesn't.

Regards!

Hi,
please unpublish one and check if everything is working. GK Image can have only one instance on page.

I unpublished one but the problem persists. I even asked other administrators if they changed something in module settings but they didn't touch it. They published articles in K2 only.

One thing more do you have latest version of Image Show ?

I have Photoslide 3.1.3 stable and Image Show 1.1.3. Both for Joomla 1.5.

Please send me Private Message with access to your joomla backend.