Why is my conversion rate falling even though traffic is growing?

My click volume keeps rising and CPC looks stable, but more of that traffic isn’t turning into real customers.

S: Click volume is up forty-two percent. C: Ad platforms detect invalid traffic through pattern recognition — click frequency anomalies, known bot signatures, and behavioral flags. I: When CPA is recalculated using only valid clicks as the base, the true acquisition cost is higher than reported in proportion to the invalid traffic rate.