Eve vs. Glow

JR • Little man born 5/28/2015. 4 losses (8/2016, 11/2018, 3/2019, 6/2019). Little lady born 4/18/2020
I used Glow in August of 2014 and it helped me to get pregnant with my first LO. Naturally, I stopped tracking my period and switched to nurture until the birth of my son. My period didn't return until January of 2016 which is when I started tracking my period again, but this time in eve. My husband and I decided to try for #2 in August this year, so I downloaded Glow again and entered all my previous periods. 
Now for the problem- eve and Glow have my period starting at different times and with different fertile weeks. What might be causing this and does anyone have any insight? 

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