Kegg vs LH strips

I’m not sure why I’m just having a hard time wrapping my mind around this concept. How can kegg be giving me my most fertile day before even having a positive LH strip? I know that sperm can live up to 5 days inside, but how is cervical mucus at its most fertile 4 days before I even ovulate?? If sperm can live “up to” 5 days, doesn’t that imply they could possibly die before my ovulation day if it’s 3-4 days before?? 😅

For example- last week Monday and Tuesday were my highest scores (95 & 96) on kegg, with the valley happening on Tuesday. Wednesday I got a positive LH strip, then natural cycles confirmed my ovulation to be Friday. We were only able to have sex Monday and Tuesday, so in kegg theory, we did great. In LH strip/natural cycles theory, we missed our *most* fertile days even though there is still always the chance it worked.

I know, I know, I think I’m overthinking it. I just want to really understand! TIA