it might be worth running tapatalk for the site. v1 is stable, and they just released a v2. each requires a few bucks, but i've found it much easier to upload pics and posts this way than use the native iOS Safari web browser
iPads do seem to go whacky, I've seen it on mine as well. Like Camshaft suggested, killing Safari seems to fix it. I've found no pattern to when it happens.