Yes. And those that aren't lying are severely mistaken. Expensive high tech equipment can fail or show weird readings ALL THE TIME. You get small piece of debris on a camera moving at mach 1 and it's going to look like something is moving at mach 1 with you, and somehow magically keeping up in strange ways before "zooming off" when it falls off the camera.
Pilots are NOT techs. Their jobs is to fly the plane and shoot shit down. They need a working understanding of the tools in front of them and do their best with the information presented. If my car says that my engine oil pressure is at 0, but somehow the car is still running, I don't assume magic. I assume ignorance and take it to a mechanic. MANY of these supposed UFO sightings boil down to such situations, and techs have verified that multiple times, but that gets ignored.