Hi there @Fafhred,
Took the time this morning to re ‘run’ this mission chain from start to end myself, as I was concerned about any notion that there might be an issue in the build system.
The actual schematics are held in a database table and what you see as ‘requested / required’ resources are directly drawn the from the database reference for that schematic.
I first looked at the actual schematics to ensure the boxes were all correctly filled and then took note of my starting stocks.
I then ran though each stage of the build noting the required amounts and the amounts taken at each stage.
At no stage of the build process did I end with more or less resources than I should have and this followed though to the last build. I manually ran and crafted each stage to ensure conformity with anything that might have got in the way or caused an issue.
So all I can put it down to, is an issue with the amounts you had notated down to give to your toons or a typo when transferring the amount over to them.