Rejected Tracks

Hi guys,
I am new to Pond 5. I managed to get my first 5 corporate style tracks accepted a few weeks ago, but I have recently had my last few tracks rejected and I was wondering if anyone could shed some light on the reviewing process as I felt some of the tracks I've had rejected were pretty good quality, although they may not have quite had a definite enough style e.g corporate/ feel good/ pop etc.
Im wondering does Pond 5 sometimes not accept tracks because of the tags and description that the composer has added when submitting?
And are there any other reasons they may reject a track other than quality and feel of the track?

Thanks