FITS viewer opens each time PHD Guiding is taking a picture - by: fsignoret

Hello,
I am using kstars/ekos (under xubuntu) + INDI web manager on a RPi.
I am guiding using PHD2.

I have the option "receive external guide frames" set to false.
But sometimes, the FITS viewer starts popping up every sec with the guider image.
In the Summary panel, the main camera picture is not shown anymore, and the guider image is displayed instead.

It is then of course not usable, and I need to restart kstars to get things back to normal.

Is there something I am doing wrong?
Is there a glitch somewhere?

Thank you!
Regards,
Florian