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Like sometimes it never picks up the drop even there's only one dropped by mob?
I've put a fix in for that (as far as I know, could be further issues), let me know if you're still getting it (the bug actually affects more than just legendary pets, but that's the most obvious symptom).
Legendary Pets seem to be picking up items based on the value of a single item, instead of the cumulative. What I mean is things like noted valuables, stackables, etc. seem to have lower priority. I noticed this while at Abyssal Demons and Kalgerions
As far as I know this was actually the intended behavior, potentially something that can be changed/made into an option if people want it.