Bbt.. Need help understanding

Hi! I need some advice please? I am using 2 different basil body thermometers to get my temperature in the mornings. I have one from target and i had recently found one I bought from Walmart. I started using the one from Walmart because I thought the one from target had a low battery and was abo

ut to die. But now im using both thermometers and they read 2 different temperatures (I'll include a picture to show the temps) I didnt know which thermometer i should use? I didnt know if i should go with the low temperature or high temperature? Thanks in advance

these are the thermometers I have been using