Try it with this search:
an entire block of smash car windows
I’ll have to test Searx, Grasp, & Kagi. Right now I start with DDG and bang out to Google (append !g to my DDG search) at least half the time.
So note to DDG devs: those Google bang searches had results that left me 
!
I get the same issue all the time lately. Search, click link, go back - clicked link gone, different results shown.
I get this but never clicked link gone. Rearranged or added results.
I always use mousewheeldown click nowadays, it opens the link in a new tab.
Also mwd on the tabs themselves close the tab (without needing to hit the tiny cross).
Changed the way I browse
That’s what I do on the desktop, but on mobile there’s no quick way to open a new tab.
Would it help turning on the setting to have the links always open in a new tab?
It’s been a long time since I used ddg, but I believe they have the option in their settings page, most search engines do.
No issue here.
Same… it’s probably OP’s📱 phone
If possible, self-host SearxNG using Docker/Podman to avoid all of these.
