Some URLs in the search results have recently (in the past week or so) started to have a strange "?srsltid=" parameter on them. From a quick search, this is apparently inserted by site owners for "conversion tracking" by Google.
Example sites that use the parameter include Consumer Reports, Harman Audio, Lenovo, and Flirc. Simply searching any of those returns URLs with the parameter.
Since Kagi is not Google, the URL parameter (and any tracking parameter, honestly) is not necessary and should be stripped out. It also introduces visual clutter to the URL.