Question!

Nikki💕 • •11.07.20•Bisexual•Dog Groomer and Trainer•#metoo•
I use both the eve app and the glow app because I like all the gems and stuff from eve but my SO is connected on glow. But for whatever reason, even though the information I put in is exactly the same for both apps, it gives me different information. Like now: eve says my firtile window ends in 3 days, but glow says my firtile window ended yesterday. Why isn't the same?