Repetier has a tendency to have some communication errors while printing out a mesh.
You can fix this by making a custom command that contains the following:
M155 S0 stops showing the temperature updates.
The G29 W gives us the status on the bed levelling and what points were probed
The G29 T1 gives us a comma delimited reading of the mesh thats generated
Finally the M155 S1 re enabled the temperature updates to the server
Once you've saved the command, go ahead and run it. You should see something similar to:
Copy and paste the text you can see in the image and paste it below.
You should now see a visual represenation of your mesh.