The log contains all the test which where executed in with that command, nothing is left out from the log by default. There is basically two options:
Your command does not execute all the test you expecting. Usually in this case you are doing something like this: robot path/to/test.robot, meaning that you executing single test suite. Instead you could try: robot path/to which will execute all the tests from the folder.
You are post processing test results and you filter out some of the test from the report even they are executed.