Google map marker error

I developed an application with ionic / angular / capacitor, a tracking application with the google map api everything works fine when it is in the machine (ionic server) but when I deploy the application and install it in an android the markers no longer appear and yet when I click on the space where a marker is supposed to be, I have a reaction as if the marker was there but invisible.
Could you give me a hand please, I remain available if you want a capture of part of the code for verification.
Many thanks

Can be CSS issue. If you have a repo will be helpful