Tesla math don't add up

So I recently went on a roadtrip for the first time in my new Model 3 Premium LR RWD. side note we enjoyed every bit of it! but before going I charged to 100% because I wanted to reach our first destination with 0 charging stops. the photo was taken the night before we left. the car said I had 617 km of range. destination was 532 km away. but state of charge on arrival is -10%. if I indeed arrive with -10% battery, shouldn't the car show I have a range less than 532km? I ended up reaching the destination with about 3% battery remaining. also, I use % instead of kilometers always. just thought this was interestingly odd. also also, you might see some weird characters thats not because this image is AI. I used magic eraser to erase all traces of location info. there was some spillover to other characters. observations I made during the trip - 30 minutes into the trip the predicted arrival SOC was -8%. one and a half hours into the trip predicted SOC was -12%. and from there the arrival SOC slowly started going up we arrived at 3% SOC.