Anyone else have this problem with date at last send message ?

https://www.dropbox.com/s/gpxd4j3o56...21-19.png?dl=0

Happens random, after i send message , date is fine, but after i close whatsup (not quit option) and open later, after 10-20 minute appears that date , i mean same date, year 1970, 2:00 hour.