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LTC5584 Q lead (or lag) I confusion

Category: Datasheet/Specs
Product Number: LTC5584

LTC5584 data sheet states on page 20:

I-Channel and Q-Channel Outputs
The phase relationship between the I-channel output signal and the Q-channel output signal is fixed. When the LO input frequency is higher (or lower) than the RF input frequency, the Q-channel outputs (Q+, Q–) lead (or lag) the I-channel outputs (I+, I–) by 90°.

But my measurement with the LTC5584 Demo Board results in the exact opposite:

I am confused... can anyone clear this up for me?