That is odd. This has never come up in our testing. We can see how it would be possible. We never planned on people taking off without an SD card... This will be addressed in our next release.
The number of flights gets incremented with every takeoff ATTEMPT which is likely what you are seeing. If you have a mission planned that says you will only need one battery but it is recalled and restarted for some reason, it will say 2/1. The first number is the executed number. The second number is the estimated number required.