From: Santa Rosa, CA
I can't explain the negative numbers, however I think the replacement log is different than the number of elements produced. You can have units take replacements without having any production, they are two different things. The elements may already be in the pool or damaged elements could be sent back to the pool and could be available to be used as replacements.
As for the support squad production, the system could do this. Given the lack of armaments, they may be all that can get built (they are cheap to build). These excess support may ultimately be sent back to the pool and/or converted into emergency rifle squads (although that may not help this unit as I don't remember if Fallschirmjaeger Squads qualify for emergency conversion of support).
I've got a few of these items on our list to look into, but it may turn out that aside from the negative values, there's no bug here, just what happens given the system and shortage of armaments points in the scenario.
All understanding comes after the fact.
-- Soren Kierkegaard