Usually when u miss a call and i get a message it shows up as call from my phone to the Voicemail. But if the connection was never established it is not logged.
I had a same issue on Samsung once, the phone just decided it will stop logging and at the worst possible time too, one of very rare instances when I really needed the log. I can't remember now what restarted the log, I remember I didn't have to factory reset as I had about a week of erroneously missing calls. I really don't like Samsung they are very heavy with the software and tons and tons background operations that I don't believe are necessary, I like loke this that are much lighter and simpler
