Artem, could you please attach the screenshot for the roles assigned to your user, moreover, if possible, create a new user with only 3 roles - SAP_GRAC_BASE, SAP_GRC_NWBC,SAP_GRAC_ACCESS_REQUESTER and check if the new user is getting the systems or not, this way we will be sure that its not an authorization issue but some other issue.
Regards,
Sanju