How to combine two detailed IFCs?

Hi everyone
I'm attempting to create a stud wall detail, It's modelled in blender (below),

and as far as I'm aware the IFC is alright but when I export it comes like this:

Bolts missing, studs relocated

I can separate the bolt and the stud walls and they individually come out correctly:
Bolt

Stud walls:

But cant for the life of me get them to export to IFC together,

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