Guild Wars 2

When I apply say for instance a minor rune of divinity to a piece of armour it shows as

Minor rune of divinity (1/2) (in Blue)

1) +3 to all stats +1 critical damage (in blue)
2) +3 to all stats +1 critical damage (in grey)

If I try and add a second rune of the same type it says it will destroy the first and overwrite it.

Doe sthis mean that ony the first one is available and you cant get the second one as well?

Attach the rune to a second piece of armor that you have equipped; you’ll get the second bonus from the rune.

Why not just have one effect then, seems a bit strange to me.

Ty for the answer though, thumbs up.