Locking/Unlocking is very confusing

This is feedback, although if someone wants to explain it to me fine, I've probably already got it though. Type fast.

As a not much adventurer, I occasionally go in, like once ever few months, and rebuild my decks. Because if I'm adventuring, I'll at least do it right.

So I drag a glyph down. It starts out locked.

Then (every freaking time) I drag the same glyph down to put my unlocked one on the bar. Goddamnit the first one disappeared!

Then I go "ok, gotta unlock the first, then drag more down."

So I do, and now I have two. Now I drag down a third. Boom, all gone again!

So I unlock that one to start again. Ah, the other ones have disappeared from my deck, I have to re-add them.

This happens every time, and some times a few times before I remember to unlock every time!

Now, the UI question: Should the second glyph replace the first, or add an unlocked one?

Now, the I can't see any reason for this question: Why does dragging a locked glyph down to the bar decrement the number in my deck, when it is replacing, not adding to, the number on the bar?