I really don't use the term "provider." And I don't know anyone, NP or PA or physician, who does when it comes to talking to patients. Everyone I've worked with introduces themselves as what they are. It's not like the term "provider" wipes out the credentials - there's still physicians and physician assistants and nurse practitioners - but yes, it can be confusing to patients. Then again, patients are usually confused about who most people are. When I was a med student, I was called a nurse a ton. Now that I'm an intern, introducing myself as Dr. _____, I've still been called a nurse, a "doctor's assistant," etc. So it's not that hard to confuse patients about who they're seeing.
That was just my explanation for why your institution's EHR made that change, legally they're all considered providers, and a large part of the documentation in EHR is for legal purposes. You can take steps to try to fix it, which I also suggested.