Back buttons, continue buttons erratic

[tvadpro]

Couldn't find anything about this, so I hope I'm not the only one to have noticed. When navigating from a product info page to either an EZpage or info page (shipping, conditions, privacy, etc.), the BACK or CONTINUE button usually takes me back to the product info page ... but not always.

Sometimes, clicking BACK or CONTINUE takes me to the main page instead.

What causes this? Is it connected with session data? And is it possible to make the BACK and CONTINUE buttons perform more consistently?

I'm currently running 1.3.6, but have noticed the same erratic behavior on earlier ZC versions.

Thanks,
Sean
See for yourself.

[tvadpro]

Any takers? Hmm?