Particle analysis - strange behaviour

Hi. I used ImageJ occasionally over the years. Always Particle analysis and always it was a breeze. Today I got it again and cannot analyse particles - the outlines look totally strange and are mostly concentrated on edges. I tried Linux and Windows version; re-checked a youtube guide - all seems right.
I get to black dots on white image, press analyse particles and it shows outlines only for noise, not the actual particles; mostly at the edges somehow. The Browser version behaves well.
The image below shows an example - right is my image to analysed.
Left - the black&white image, analysis settings (I adjusted all settings to no avail), the right are the outlines with absence of most particles at the centre.

Am I getting crazy?

Start by reproducing the Particle analysis report with the attached black-and-white image and the stated settings in the desktop versions, then compare the result with the browser version. Trace the Particle analysis entry point and determine why desktop outlines select mostly edge noise rather than central particles. Done means the cause is identified and particle detection is consistent across the reported environments.

Written by the indexing model from the issue text.