Display “Travel information”

For “driving information” the average consumption is displayed for each minute in the form of a vertical bar. If an “E” appears in the bar, then that means that 30 WH have been recuperated. Questions about this: 1. Sometimes one of the bars is interrupted. What does that mean? 2. Occasionally only part of an “E” can be seen. What does this mean? It cannot be a pixel error, because the respective bars migrate with their fragmentary E or their interruption after link s.