Incorporating role permissions within a button...

I'm trying to create a conditional statement to hide a button based on one of two statements being true and the user role not being equal to the admin role (ID 12). When I run this in separate browsers, one using a role other than 12 and in the other browser logged in as role 12, the button is hidden in both cases. 

I'm using the Using formula - multi-select text fields documentation for the 'role' field since my variable is (var roles) a multi-select text field.

var text roles = ToText(UserRoles("ID"));

If ( 
        // Is completed or voided
        ([Stage] = "Completed" 
        or 
        [Voided] = true)
        
    and
    
        // Role with ID 12 == "Administrator" 
        // Not Administrator
        (Left($roles,3) <> "12 " or
        not Contains($roles,"; 12 ;") or
        Right($roles,3) <> " 12" or 
        (not Contains($roles,"12") and Length($roles) = 2))
    ,
         // Show nothing
        null
    ,
        // Else, the button should display
        URLRoot() & "db/" & [_DBID_TASK_ITEM_DETAILS] & "?a=API_GenAddRecordForm&_fid_11=" & URLEncode ([Record ID#])& "&z=" & Rurl()
)​

------------------------------
AR
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I was able to solve this by flipping the logic between the "and" statement. I also realized that I only wanted to display completed or voided records if I was logged in as the admin. What I have below works.

var text roles = ToText(UserRoles("ID"));

If ( 
        // Is completed or voided
        ([Stage] = "Completed" 
    or 
        [Voided] = true)

    and
    
        // Role with ID 12 == "Administrator" 
        
        
        (Left($roles,3) = "12 " or
        Contains($roles,"; 12 ;") or
        Right($roles,3) = " 12" or 
        (Contains($roles,"12") and Length($roles) = 2)) 
    or 
        // Role with ID 22 == "Solutions Champion" 
        (Left($roles,3) = "22 " or
        Contains($roles,"; 22 ;") or
        Right($roles,3) = " 22" or 
        (Contains($roles,"22") and Length($roles) = 2)) 

    ,
        // If true, the button should display
        URLRoot() & "db/" & [_DBID_TASK_ITEM_DETAILS] & "?a=API_GenAddRecordForm&_fid_11=" & URLEncode ([Record ID#])& "&z=" & Rurl()
    ,
        // Is not completed or not voided
        // Show button regardless of role
        ([Stage] <> "Completed" and [Voided] <> true)
        ,
        // If true, the button should display
        URLRoot() & "db/" & [_DBID_TASK_ITEM_DETAILS] & "?a=API_GenAddRecordForm&_fid_11=" & URLEncode ([Record ID#])& "&z=" & Rurl()
)​