Stupid question about facility construction that should be obvious...

[MegaTrain]

Playing a solo game today on patch 1.41 (not the new one), I switched one of my newly-colonized planets to emergency mode (3000 per turn), and put a whole bunch of Research Centers in the queue (1500 each).

Should build 2 per turn, right?
Nope, only 1 per turn!

Is there a hard-coded limit of only 1 facility per planet per turn? I had always assumed that it would spend the extra resources on the next item in the queue.

This also seems to be the case with units. If you queue up a Weapons Platform x2 it will build both, but put a solo item in there twice, it only builds one.

Is this a bug or just a VERY LAME feature?

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-MegaTrain-
Athlon 1.3 GHz running at 1.6 GHz on an iWill KK266