Hero panel small weapon & backpiece bug.
I couldn’t see what you were seeing at first until I realized: that’s about the size they appear for asura. Looks like your game isn’t sizing them appropriately when they first display; as soon as you do something that would force them to refresh, it does.
It’s likely to be something on your PC, perhaps a mildly corrupted file. Try using the command line option “repair” (takes 20-40 min, unless you have a fast drive). See the wiki page, http://wiki.guildwars2.com/wiki/Command_line_arguments
If that doesn’t work, you’ll have to contact Support by creating a ticket. Good luck.
The hero panel shows wrong weapon and backpiece sizes since it has been introduced. In case of Asura it shows them too big – but when you tab out of the preview (e.g. to minipets or something) and tab in again it shows the correct sizes – didn’t know it’s vice-versa with big chars
I’ll try to get some screens from my supersized spinal blades
I have this issue as well for a couple of weeks now.