Visualisation in results section not correct for a simple prick

I try to follow a simple tutorial on youtube (https://www.youtube.com/watch?v=q_yVhJeMqQM) to model the heat transfer in a simple copper prick.

In short: The prick is of copper (400 W/mK), BC for one side is 400 °C, for the other side 300°C. Heat should be transferred from one side to the other.

Problem: The visualization in the results section does not look like in the video. Only one part of the prick gets darker, but the rest of the prick is not influenced by the temperature (see pictures).

Here is the link to the .cae file (abaqus 2017): https://bardhome.de/index.php/s/x2t3TL9HFXSXpar