Your might want to provide some further detail, i.e. iPad 1 or 2, jailbroken, & iOS version; also, did this problem happen after some change/update and a new observation - just a few questions to hopefully help others to respond. In addition, does this happen on all websites or just a few?
Just a few other steps (which you may have already taken, if so my apologies) - double click on the home button and press on Safari, when the jiggling occurs tap on the X and then restart: if not of help, have you restarted and/or reset the iPad - if not give those options a try - good luck & please respond back if none of these suggestions are useful - good luck!
Good to hear from you. You’ll find a whole bunch of iPad enthusiasts in this Forum who are only too willing to help other iPad owners and to hear of their experiences. Don’t be afraid to post any questions you may have or use the ‘Search’ button near the top of the Forum web page. I usually find I discover one new interesting and useful piece of information about my iPad every day - and often not even what I was looking for!!
Hope to hear from you soon with your thoughts about the iPad.
Have fun and enjoy your iPad
If you don’t already have it you can download a copy of the iPad manual for free.