Glow isn't changing my fertile week!

I use Ovia and Glow. My predicted fertile week was the same on both at the beginning of my cycle, which would have been throughout this coming weekend. I only log temperature (to 1 decimal place), CM, cervix and symptoms. No opk's. Ovia changed it to last weekend and ending yesterday based on my entries. I feel like this is accurate based on the CM I had, but I'm fairly new to tracking. Glow hasn't changed anything and says my fertile week started a day or two ago. So they're pretty much a week different. My SO is currently working out of town so we only see each other on the weekends. I don't want false hopes that I'll ovulate while he's here and am a little frustrated. Is Ovia more sensitive? What makes Glow change predicted fertility? Do you feel like one is more accurate? Thanks!