How to create multiple Mutagen of same type?

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I have 9 'Lesser Blue Mutagens'. In Alchemy, I can create 1 'normal' Blue Mutagen with 3 of this small mutagens.
But if I try to make a second 'normal' Blue Mutagen, I get the hint: "You already have this item". Thats true, but I need 3 of the 'normal' Blue Mutagen for the next 'Bigger Blue Mutagen'.
What do I have to do to create multiple 'normal' or 'Bigger' Mutagen from 'Lesser' mutagens?
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Can you combine mutagens?
Just to add to this you can't combine monster mutagens, only ones that are called "Colour" Mutagen.How do mutagens work Witcher 3?
Different types (colors) of mutagens grant different kinds of bonuses. Each Ability placed in a slot near a mutagen of the same color increases that mutagen's bonus by 100%. So if all three Abilities in a set of slots match their nearby mutagen's color, the mutagen's bonus will be increased by 300%.ULTIMATE Mutagen Guide | Get 20 Free Levels! | How To Use Mutagen | Ark Genesis 2 Guide
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