What contributes to fluctuations in Ahrefs' search traffic estimations?

Ahrefs' search traffic estimations are influenced by several factors, making "All of the above" the correct answer. Fluctuating keyword rankings directly impact estimated traffic because a site's visibility for specific keywords changes, altering the potential clicks it could receive. Search queries (keywords) that Ahrefs does not know about represent a blind spot; if Ahrefs' database doesn't contain certain keywords a site ranks for, it cannot attribute traffic from those terms, leading to an underestimation. Finally, CTR (Click-Through Rate) approximations are crucial. Ahrefs uses estimated CTRs for different ranking positions to calculate how many clicks a site might get for a given keyword. If these approximations are inaccurate, the traffic estimate will also be inaccurate.