Certain organizations use software to hunt for key words and only bubble up those that end up with matches.
So if your resume doesn’t hit enough of those terms IE you have expertise in Creo but not “Pro-E” then you get a 0 for those terms.
I’ve seen it first hand from both internal and external recruiters who don’t have the complete picture of understanding but are meant to look for certain terms/skills or more importantly, big named companies as an indicator of skills, experience or fit.