Were all the BioPAX files generated from the original ACSN CellDesigned maps (xml) with BiNoM Cytoscape (v2.x?) plugin, without any additional data?
BioPAX problems (at a glance):
some EntityReferences have no xrefs;
ProteinReference, DnaReference, etc. entity references have gene names in relationship Xref.id, though Xref.db="HGNC" instead of "HGNC Symbol" (these are not the same type of ID);
there are Catalysis interactions having 'INHIBITION' controlType (only 'ACTIVATION' or null is allowed); so, Control class should be used instead Catalysis in all such cases.
There are reactions that convert one protein to another type, e.g., EYA -> EYA3...
NaviCell (not in MIRIAM registry); PMID:24099179
(They integrate at least 5 original pathway/interaction data sources. I could not find human BioPAX pathway data out there...)