The CreateNewLogFileDaily property, when set to True, should force inclusion of the date.
There might be a bug with the FileNameIncludesDate property, so set it to False as a test.
I might have time tomorrow to check this and give you some more info.
Out of curiosity, your screenshot shows 2 log files: mylog1-08-Nov-2018.log and mylog1-09-Nov-2018.log.
What settings you had when these were created?