A personal pet peeve of mine as well, and a good example of when a product is trying to be too clever. I think (suspect) what is happening is that it is remembering partial matches and your selection, but like you I find it has the opposite effect.

If I type `f`, the first item on the list is Firefox, if I then type `fi`, it selects Figma instead. Keep typing, `fig`, now it has a Safari tab selected instead for figma.com. Pinnacle UX.