Displaydesigns not editable

I've installed several different displaydesigns to my fenix5 (with garmin connect app on iOS). They all we be displayed correctly, but all layouts (colors, designs, datafields, etc.) will not be changed - even tough the app says "settings succesful stored".

Removing the displaydesigns and re-install, removing the fenix from the iPhone (therefore also from the garmin app) isn't succesful too ...

Anyone out there who knows a way to bring the displaydesigns to work ?

Thank you in advance :-)