SC can't change the web page -- but what it does is send simulated keyboard presses to the target application to get it to scroll up and down..
Although I've never heard of this happening, it's conceivable that one of the keyboard presses it sent to the web page (pageUp, pageDown, Home), could have temporarily changed the way the web page was displaying.. But SC can't make real changes to the way a website displays..
More likely it's a coincidence, and the web page became unavailable or if you loaded it a few times the website got paranoid that you were reloading it too frequently and put a temporary block on you. It should fix itself.
Let us know if the problem persists, and perhaps we can help figure out what went wrong.