If /wiki <item> does not work, just refresh the page with F5 and it should work, this is a known issue already. https://wiki.guildwars2.com/wiki/Guild_Wars_2_Wiki:Reporting_wiki_bugs#Page_requires_a_refresh_to_properly_load_javascript
Regarding the other bugs, best summed by Greener:
Also people from ANet are looking at it, though it is hard to fix a problem where the cause is not known.