iPad Safari tab not closing

I have an ipad 3. In Safari when I have multiple tabs open and then start closing them, the 3rd tab will not close. If I close the 2nd one, the third one (which now becomes the 2nd...i hope that makes sense) closes OK.
I have searched the net for answers but cannot find one. It seems I am the only person having this issue!
I have cleared all the history and internet information under 'Settings'.
Not sure what else to try. Any ideas?

Thanks Doctor,

But I have tried those things many times.
I'm beginning to wonder if there is a 'dead' spot right where that 'x' is. If I turn the iPad so the screen flips it closes fine.
I don't even know if that's a possibility??

Well I finally solved the problem. I found after wiping the screen with a damp cloth that I could see a fingerprint underneath the glass that was replaced 2 months ago. This fingerprint was in the exact place that the 'dead spot' was. I took it back to the place that replaced the glass and they replaced it again and all is good now.