I've tried your two links again.
The first link do work as intended in firefox for mobile. (it's possible to scroll vertically and horizontally).
The second link indeed is "fixed" and can't be scrolled around.
You talk about a "piece of site", I hope you're aware C2 isn't meant to be used as a tool for website design. It is and stays a game maker tool.
As a "workaround" have you tried to set the layout property "unbound scrolling" from No to Yes ?
This might help with the scrolling.