This is a mistake. I bought 2 digispark pros, one with my robot kit and one standalone for another project. Both were received with a 3pin header and 2, 9pin headers. You should get them to replace the header.
The issue I found with the robot kit is the spacing of the motor attach blocks did not match the spacing of the holes on the board. Similar problem for the free-running wheel. The width was correct but the length was wrong. This is fixable by re-drilling but a pain.
Finally, my motor control board had a bad channel so only one motor worked. This has been replaced by digistump.
Everything else was great. I haven't tried the bluetooth board yet. That is next.
Let me know how your assembly goes.
Bob Tausworthe.