When I export the attached .xsd file to .car format, two of the hydrogens at the base of the cell become incorrect. Specifically, instead of being SiO-H bonds, they become SiO ------------- H bonds across the cell to a seemingly random H. 

Is there a fix for this? These hydrogens were generated using the 'Adjust Hydrogens' GUI tool, so I suspect its an issue in the way the atoms are being internally indexed when this is done. 

I'm using Mat Studio v8.0.100.21 on Win 10, 64 bit.