Does redirection take place if you deactivate User Role Editor Pro? Then some other plugin may cause a problem. Try to deactivate all plugins then activate them back one by one to isolate a reason.
Does redirection take place for other users with this role, but without restriction to edit just one page?
Do you see “Admin menu” button at User Role Editor Pro toolbar? If “Yes” open it for role, with which use is redirected. There are any blocked menu item there? “Admin menu access” additional module of User Role Editor Pro may cause such redirection.
