Trouble adding previous periods

M
Hi All!
I just joined and I'm trying to input all the periods I've been tracking in my menstrual calendar for the last five years.
I got all the way to December 2012 and the app refuses to let me put two periods in. But I did have two periods! One 12/3 - 12/8 and one 12/29 - 1/3. Every time I try to add the second one it deletes the first and vice versa.
Also, once I get to 2012 the app automatically resets my period to 5 days, my average length. But sometimes I bleed for only 3 days or as many as ten!
I'd really like to add all the data I have so Glow can give me more accurate predictions.  Any suggestions??
 Thank you!!!