Digital vs strip OPK

I used digital OPKs this month for the first time after getting frustrated with the strip OPKs.

I got a peak on the digital test today (yay!) so thought I'd try a strip again. Still negative. I've never got a positive on a strip opk.

Is there possibly something I'm doing wrong with the strips? I'd like to use them if I can because the digital tests are so expensive.

Has anyone else had this issue? I'm thinking it might be that I just have low levels of LH.

Hopefully I get my BFP this month and won't have to worry 😊