SharePoint Online Permissions bug

I am having issues with SharePoint Online permissions on my site. When I add a new user to the site I would place them in a group with "Read" permissions.

However if I then view users under "Site Permissions" it would show that the new user would have "Read" and "Edit" permissions, though the user would still only actually have "Read" permissions, the "Edit" is just a false showing (shown below).

To further this, if i then change the users "Edit" permissions to "Read" the user actually loses all permissions and cannot access the site again. I have attached some pictures to help describing this

Changing permissions from "Edit" to "Read"

User now has no site permissions

This issue is causing some inefficiencies as we are not able to easily determine a users permission level at a glance.