The "P" is for Pacific, meaning the west coast feeds. ViacomCBS networks (which includes Paramount) and NBCUniversal networks offer either Eastern or Pacific feeds, but not both, based upon the geolocation performed on your DVR server. Other networks (like Warner and Disney) give you both Eastern and Pacific; or they only have an Eastern feed (like A+E and Discovery).
So, it looks like you're getting the Pacific feeds of ViacomCBS networks, but the Eastern feeds of NBCUniversal. That would explain why you think your Paramount feed is 3 hours off: it's 3 hours later than the feed you're probably expecting, but correct for what you are actually receiving.