Impossible to edit Marker

Hi there!

I’m using Map Block since a couple of years to locate on a map the shops that distribute our products.
We use a custom Icon for each shop and add some information to help our customers.

I have to add and modify a couple of markers but cannot.

There is no way to select a custom icon and no way to complete the form for typing info.

Can you help me on this?

Thanks in advance!

PS: My site is regularly updated (WP, WooCommerce, and all plug-ins)

The page I need help with: [log in to see the link]