FYI, Pauldrons of the Glacial Wilds got an extra socket in 3.2.2 that hasn't been refreshed into the site. I didn't notice until it dropped again tonight for me and saw I was missing the socket and the bonus -- doh!
Info about items is taken from wowhead ,and that is the same link that you gave us. Wow heroes tool tip is the same as ingame one. Only place where you can not see socket bonus is blizzard armory.
Shoulderpads of the Glacial Wilds (wowheroes).JPG (89.66 KiB) Viewed 932 times
Shoulderpads of the Glacial Wilds (armory).JPG (138.68 KiB) Viewed 932 times
You mis-understand. The tooltip is fine, but the display of the item on the character sheet isn't showing it. My guess is you pulled the info from wowhead in 3.2 and of course had no reason to re-pull it in in 3.2.2.
Check 'Loukno' on "The Venture Co" (US) Resto set. If you hover over the item in the far left the tooltip is pulled and displayed correctly, but wow-heroes is only showing the one socket (and no empty socket).