All Footprints have pad numbers. Are all the Pin 1 pads in the same orientation in your original PCB file? Actually I don't know if resistors are all in the same orientation when they end up on a reel. Anyone else know?

Resistor orientation is not specified in any of the tape and reel info I have looked at in datasheets.

Hello ; About the part orientation rule, zero orientation for PCB library should match the component orientation in the packaging(tape/reel). About how the board is assembled, since the board is panelised on the a big panel with other boards from other customers it so not all the components will be from the same one reel. About the polarity defining, as Andy said Footprints have pad numbers for all components and for the polarity of the components we define it through two possible situations : * 1\. Basically\, we will judge them according your silk layer\. If there is no silk layer or no any points for the us to judge how the components should be on your pcb\, we cannot recognize the correct polarity\. Then we will confirm with you via email\. Due to the time difference and other uncontrolled issue\, it will cause production delay\. Therefore\, we recommend you to add  silkscreen layer to your PCB so that we can confirm them easier and faster to avoid production delay\. * 2.When there is mark point in the silkscreen layer, but it is inconsistent with your CPL file. In this case, we will make the placement according to the silkscreen layer by default. Thus please make sure your file is correct to avoid the misunderstanding For example, for the component C1, the “+” (Anode) is matched with the mark point in your silk layer by default, but in your CPL file it is reversed (as picture 2), then we change the polarity from the original part placement into a corrected part placement according (as picture 1) to the silkscreen layer in the file without asking.                                                                                               

@andyfierman Yes, all resistors are in the same orientation, DFM image confirms this. You can be sure, if the reel is not in the same position, the result may be different. Thank you.