Does the Glow app have a glitch or is it me?

Davone • I`m a happily married lesbian who is trying to start a family with her wife. TTC baby #2 the 1st is 21 yrs old.
I added to my app that I got a positive opk kit on June 7th but Glow has the ovulation sign under June 8th. The same thing happen this month I added that I ovulated July 2nd with a positive opk  but Glow has the ovulation sign under July 3rd. Is it a glitch with the app or am I reading this wrong?