With two unequal-height monitors side-by-side, there is a part of the X virtual screen which is permanently "off-screen". (e.g. in my set-up, 1440x900 and 1280x1024, the 124-pixel block below the left monitor is invisible).
With lxpanel set for "bottom" and "left" or "centre", all or part of it is in the invisible part of the screen.
In contrast, the XFCE panel understands xrandr "monitors" rather than being based on the overall X virtual screen, and places itself correctly on the bottom of the left monitor if that is its selected position. (The disadvantage of this model is that XFCE can't extend the panel across two monitors (I think) while lxpanel can, in my case, at the top, say.)
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