Gray image in Homey app

Hi all,

From the begin I see a gray picture of me or my girlfriend in the homey app, see below.

I have reinstalled the Homey app en reboot my phone, also added a new picture.
In the homey forum I see the right picture.

Anyone have an idea?

Have you already tried to export to a different resolution?
Other suggestions are: export to an other picture type, use an other picture editor.

I tried both with no results. The photos are visible on my girlfriend her Samsung S8 but not on my Samsung S9.

Created ticket by support homey.