Cannot find photos when 2 sim cards are in their slots

I did a factory reset of my phone (hoping it would solve a nasty problem). After that, I found that I had lost my photos. Had been warned for that, so it was all my own fault.
However… working futher on the nasty problem (FP2 reboot: due to dual Sim cards?), I removed my simcards from the phone. To my surprise, then I refound my old photos when using the photo-app.
I could still see the photos with one sim card in its slot.
But the moment I had both sims in, the photo app told me that there were no photos to show…

Who can help me find the photos that must be somewhere on the phone, still?

Thanks!

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