Possible bug in specifying a selection range?

Hi,
Using this function for the first time, in a long audio file. My markers are defined, checked, and work OK. However, as shown in the attached screenshot, choosing them in this dialog yields some off results. The timing of the markers listed in the drop-down menu is correct; The selection time it calculates (in blue at the bottom) is not. Not big deal if it’s just something screwy with my particular file, but bringing up in case it isn’t.

Thanks,
Brian
Screen Shot 2015-12-25 at 5.43.28 PM.png

Which WaveLab version?

Ah, sorry-- 8.0.5 on Mac OS 10.10.5