Sukayna bint Al Hussein AS

Majority of scholars say that Sukayna AS was martyred in 5th of Rabi' 1

But shia apps which have calendars in them say that safar 13 is the date of martyrdom of sukayna AS. Any clue why? And then the shia calendars on these apps don't show that 5th of Rabi 1 is date of martyrdom of her AS.