pack contains [Heating Coil Module], I still need to spend material again to rebuild [Heating Coil].

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Why can't the [heater coil module] removed from the Super Sledge fit on other legendary Super Sledge?

And every time I switch to a [no-upgrade] or [stun pack], Even though my pack contains [Heating Coil Module], I still need to spend material again to rebuild [Heating Coil].

Why is this? I have tried reinstalling the game and "steam" verifying the integrity of the game and starting a new game and it still does this.

Is there any way to fix this? Or is this a bug in the underlying code of the game?