Steps to replicate:
1) Have more than one blueprint in an area that use the same resource.
2) Have more than the minimum resources needed to build the one particular blueprint you're interested in.
3) Order a nearby pawn to prioritize building the blueprint of interest.
4) Pawn will dump resources into blueprints between them and prioritized blueprint until those (not prioritized) blueprints are full.
5) Pawn reaches the blueprint of interest with less resources than are needed.
Optional) Curse furiously at the screen as the pawn completes the non-prioritized blueprints then walks off to have a beer.
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Example save is attached.
The pawn "Chaz" is standing next to a stack of 51 steel that is un-forbidden.
Before unpausing, order Chaz to prioritize the building of the equipment rack.
Press Play.
*Chaz will drop 50 steel into the table next to it, completing it, and only have 1 steel for the equipment rack*
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Expected behavior:
A) the pawn should reserve the 30 steel required for the rack and only drop off 21 on the way there
-or-
B) the pawn should drop off resources at the rack FIRST, then put any extra into nearby blueprints
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Bug confirmed. I have listed it on Mantis here: https://ludeon.com/mantis/view.php?id=2658 Thank-you for reporting this.