As for the sig, both vbulletin and your browser have caching funtions. It's possible one or the other has something stuck. I would suspect its vbulletin. It may only rebuild it's cache on a set interval. It does this to conserve resources so it won't have to generate everyones signature from bbcode to html on every page access. Currently I see your sig as:
75g Planted goldfish tank, 150 Oscar tank 6 gallon el natural planted tank and 10 gallon planted tank.
Instead of use Quick Links / Edit Your Details, which matches the link supplied earlier in this thread, I am using Control Panel / About Me. This only lets me edit one field at a time instead of all of them. But, it works.