The actual ICAO 2015 shows round the Stuttgard CTR: In the inner circle:
E 1000- 3500 ft
C 3500 - 5500 ft
D 5500 - FL 100

Skydemon shows:
E 1000- 3500 ft
C 3500 - 5500 ft
D 5500 - FL 100
D 4500 - FL 100 - this is the miracle!
So according to Skydemon there is between 3500 - 4500 ft at once in the same altitude Class C and Class D.  Same issue above the Stuttgard CTR!
I do not understand this...
Who has a solution?
Claus

We are not airspace designers. Please see AIP Germany ENR 2.1 for a description of the airspace around Stuttgart. You will see that a large section is Class D from 4500-FL100.

You may recall that in an area where two different classes of airspace are defined (such as this) the higher classification takes precedence. Therefore, Class C would take precedence. It's likely that in the cartographically-produced ICAO chart they have made this simplification for you. However if they have not told you that Class D extends from 4500' upwards for a large part, that is an error in their chart. SkyDemon, being vector based, shows you the airspace as it is defined.