Butter is a fine choice as a carrier, better to clarify it first (ghee)
Coconut oil is the preferred carrier in a lot of stoner circles and the fat of choice for me, depends on what you are making
Am I to assume you did your decarb, let the wax solidify and liquified it into the butter and mixed
Then made your treat mixture with it but no more heat in the process
If this is close then there may be an issue with your decarb
Is your oven or other method of decarb accurate temperature wise, this is a common problem, buy several oven thermometers and check your temps
This method tells you where your oven temps really are and you can get rid of or return any thermometers that were way off from the others
Not expensive and a must if using an oven for decarb
If the decarb is not the issue then maybe dosing
This could be too little concentrate in a lot of butter or the aforementioned 2 killer treats and ten duds
So,
Is your decarb accurate?
How much butter did you use?
It is rarely an issue but was your wax potent?
Edibles are easy once you get your decarb down and perfect your transfer method
Edit:in the above posts I spoke about using stainless steel to decarb my crumble
Instead going to try silicone cupcake liners