Average menstrual cycle can mean one of two things:
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It simply means that you have a 35 day menstrual cycle, nothing more than that. The typical menstrual cycle is 28 days but everyone is different so some women have longer cycles.
It doesn't mean anything - unless you use fertility awareness method you cannot know for certain when your period is due, you can oly predict when your period is due based on past cycles. Anything up to a weeks variation from your average menstrual cycle length is considered totally normal. As long as there's no risk of pregnancy there's no reason to worry about a few days 'late' from when you were expecting your period - if there is a risk of pregnancy then take a pregnancy test to put your mind at ease.
If you are menstruating twice a month, it means that your periods are irregular. Normal menstruation occurs once a month. You could make an appointment with your doctor to discuss your options if your menstrual cycle is bothering you.
Mean is the average.
It means just that - you came on your period twice in one month - it's no more complicated than that. If this was your period, and not your period plus some other vaginal bleeding caused by something else, then it is normal to bleed twice in one month occasionally. The average menstrual cycle is 28 days and as most months have more than 28 days if your cycle is this long or shorter you will see yourself bleeding twice in some months.