It sounds like Safari "crashed" it can do that now and then. Usually when your iPad acts screwy like that, doing a restart will clear it up. Hold the Sleep button for a few seconds, then move the "slider" to power off, wait a second and turn it back on. The iPad can "load up" a needs to be reset periodically.
For a "deeper" reset (if restarting doesn't clear up a quirk), hold the sleep AND home button for several seconds until it powers down, wait a few minutes, then restart.
These procedures work for clearing many weird behaviors, hope this helps you out!