Upgrading runes

In the socket tab when you want to upgrade runes, it will upgrade ALL of that kind in 1 click instead of only upgrading 3 runes to next tier.

Fx if I have 90 Lesser Iron Runes and I click "upgrade", it will upgrade ALL 90 Lesser Iron Runes to 30 Iron Runes.

Imo it should only take 3 Lesser Iron Runes and upgrade those to 1 Iron Rune.
If I want more Iron Runes I just click it again. It should never upgrade the full batch in 1 single click.