As you can see, split 2 and 4 are way off.
Also Splits 1, 3, 5 and 7 are exactly the same.

ErgData uploaded this to the C2 logbook. As you can see the Splits data (and the overall result which is calculated from that) does not reflect the real Data that was recorded in the Workout Graph.

This was on an Erg in the Gym, so i am currently not able to verify if this data was also stored in the PM5 memory.