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Why does glow move af date?

Kaci • Sun, Dec 20 • Mommy to Kooper Thomas(7.9.13) and Karlyn Sarah(3.29.17) Aunt to my "first" baby Elijah Jayden(5.5.02)

Cd 1 for me was dec8th and glow said af due Jan 5th then it moved to Jan 6th. Got my first smiley this morning on clearblue easy read and it has moved af due to Jan 4th now. Why does it move the date so much. I have 28-29 day cycles. So now with the most recent move that would make a 26 day cycle. Ugh glow...