Which would you trust/go off of?

I have always tracked my periods through Flo. I recently downloaded glow this month since I started using OPKs.

Below is my tracking from Flo (been tracking my periods for 12 months using this app):

Looking back, I have almost ALWAYS had a 30 day cycle (one month I had 33). With that being said, Glow is giving me something totally different (picture below)

I did OPKs this month and never got a positive, although it is possible I missed my window on CD 17 since I went 24 hours in between testing.

Which app would you trust? According to Flo, I’ll be getting my period September 29, and according to Glow, not until October 7!

It just seems a little crazy to me, for it to be so off. Sorry for the long post, just trying to get some advice/tips from ladies who are more experienced in this as this is my first month doing OPKs.

Thanks!