Used a redeem code, but the assets isn't showing in my library

I bought an asset bundle on Humble Bundle — it came with 30 assets in total. I was able to redeem all of them using their codes, but there’s one asset that shows up as “in my library” when I search for it in the store, yet it’s not actually showing up in my library.

I’m wondering if this is a common bug with the site, because it’s been at least a day since I redeemed everything, and it still hasn’t updated to show that asset properly in my library. Does anyone know if there’s a fix for this?