Fertility Friend vs. Glow

Desirae • TTC after miscarriage in Dec. 2015 at 4 months due to Down syndrome
I've been tracking with FF for 2 months and just added Glow yesterday. Both apps have the same info ( temperatures, CM) but they are giving me very different predictions. FF puts me at 5 dpo, but Glow says I have yet to ovulate. Any one using 2 different trackers and experiencing the same issue?