Need help with clear blue advanced digital!

I used this test this month for the first time and I'm so confused! I had high fertility for 7 days then I got the solid smiley. I also was taking strips I got from rite aid at the same time. They matched with the peak from the clear blue advanced digital. I noticed my temp went down this morning (48 hours after peak) so I took another test. Rite aid test was very positive still. But clear blue was the empty circle. I'm so confused. What is going on?! Any ideas? Anyone else experience this?