Runes stop at 12 ?

I have the following stats before runes

Healing Prayers: 10
Protection Prayers: 10
Divine Favour: 11

This is what the set up SHOULD be after runes

Healing Prayers: 13 (+3, 2 Runes and Scalp Design)
Protection Prayers: 10
Divine Favour: 13 (+2, Runes)

But I have

Healing Prayers: 12
Protection Prayers: 10
Divine Favour: 12

Here is a link to an image I made to show the runes on my equipment.
http://img211.echo.cx/my.php?image=runes0xk.gif

my question is, Is this normal ?

rune effects dont stack over all i believe. this prevents people from having 24 points into a skill. so the most you can have i think is 16 since you can only use one rune for that skill (+3) and then your head piece

Yup, runes do not stack!! So with a base of 10 in healing, +1 head piece +? Rune you'll be at 12/13/14 depending whether the rune is Minor/Major/Superior.

Thanks, confusion avoided