Different results on different OPK readers

Rebekah

Hello! I am currently tracking my ovulation in preparation for ttc in the next cycle or two. I am still breastfeeding my 17 month old (~3 times a day) and got my period back about 13 months pp. I'm using the Premom test strips and uploading to both the Premom and glow OPK readers, but the two apps are giving me very different results and I'm not sure which one is more accurate? I know with breastfeeding my ovulation might not be regular yet. Also not sure if the up and down t/c ratio are related to WHEN I am testing, breastfeeding, if they just aren't that accurate, or something else. Has anyone had a similar experience with the two apps and with results like these?