(to me it looks like some kind of particle accelerator experiment happening in your browser, where ก็็็็็ emits some kind of unknown radiation. After closer examination [zoom to +300%]: maybe it just shows the escaping life spirits of the toppled latin small letter «u» after being shot in right side.)
It's actually more correct on your browser. It's a stack of diacritics. The rasterizer above was printing them on top of each other, which is (well, seems likely to be) typographically incorrect. The problem of course is that the implemented rules should disallow unused-in-the-real-world combinations of diacritics but don't.
I have tested with Firefox (latest version) on Windows XP and 7, and I think we can conclude the problem comes from Windows XP, as it shows the same thing as you, whereas it gives a whole big stack on Windows 7.
I actually get a different rendering for some reason. I get all the extra diatricts to the right above empty circles. That certainly explains why I didn't quite understand the problem.
