Don't be as dumb as I am when it comes to the shop.

I'm new to ARPG's.

When I've been buying Shattering Runes I have double clicked on them, thinking I'm buying them.

What I'm actually doing is picking the item up (buying it) and then putting it back down into the vendor (selling it). For some reason I thought I bought them and they were automatically stored in the "crafting materials" section of my own bag.

It wasn't until later I noticed I hadn't bought any at all, and have just been buying and selling on the spot.

Good luck!