Why is my favorites "tab" filled up?

[Angelhearth]

If you don't have any Favorites selected, it will automatically list the last items you crafted on that job. If you have fewer than the max number of Favorites selected, it will fill up the remaining slots with the most recently crafted items. Selecting Favorites will overwrite listed items that weren't marked as Favorites and will automatically sort to the top of the list.

There's no way to prevent it from happening but it doesn't prevent you from Selecting your Favorites at least.

So much for having a favorite tab.