everything but one item on this toon

I had everything but one item on this toon. I did not have the spineclaw crab pet, I had that on a different toon on a different realm.

So I log onto that other toon..world of Warcraft po. getting some valor and I think, 'Oh, I should log onto Endaira and finally get the bigger bag achieve'... I log onto Endaira, don't get it, check the achievement progress and now I have NO progress towards it even...

Hopefully this can be fixed because it's making me really worried that it even lost my progress on the achievement...