My apologies if this is the intended behavior.
Typing in the search box then switching tabs (e.g, clicking "Images" or "Web" below the search box) causes a search to be triggered, even if we didn't press the search button and we didn't press Enter.
My wife spotted this issue because she searched something on Kagi Images, then edited her search to something else, changed her mind and clicked on "Web", expecting her original search query to be used.
I was able to replicate this issue on both desktop (on two different computers) and mobile.
When switching tabs without pressing the search button, we would expect the original search query to be used.