Hey Mike, there are currently 4 different types of "trips" in the system. You shouldn't necessarily see all of them, and I can see where are few are slipping through. Each trip has a start and end odometer, start and end range, plus other information related to it.
1. DrivingTrip. This is probably what you expect to see, which when you get in the car and drive somewhere. odometer goes up, range goes down.
2. ChargingTrip. This is what we use to measure a charge. This is mostly interesting to see at superchargers, since you can track the speed that the battery gets energy. Generally, if your battery is warm, it starts out high and then comes in slower and slower. The tracking screen should give you estimates of what your charge will be in 10 minute increments of the future, and how long it will take to get to 50 mi, 100mi, 150mi and 200mi of range.
3. PhantomTrip - This is what you were seeing. A phantom trip is where the car is stationary, the odometer is the same at the start to finish, and the car didn't move, but the range went down. This is especially pronouced in the north where the temp is cold and its windy, and energy is used to keep the battery within operating conditions. This sometimes called vampire drain.
4. ChargeReport - This is a "trip" that starts when you unplug the car until you plug the car in again. For example, I don't ahve a regular place to charge my car in, so I charge at a local garage and then drive around for days until I plug in again. My charge report will tell me how many days I went from plugging in, how much mileage was lost to phantom drain, traffic, etc.
You were probably seeing both a PhantomTrip and the ChargeReport in the profile/trips section. It should be labeled better soon.