Compass bar icons don't appear where expected

Question

I try to recreate the compass from Skyrim in Roblox and I stumbled upon a problem regarding quest icons.

I have already programmed the directions of the world and now I struggle to program quest markers. I have waypoints on the map and count angle between the player and said waypoint and then I try to place the marker in a right place of the compass. Nevertheless, the quest icons are shown in wrong places.

Here is the code for the general compass:

while true do
    local delta = wait(1/60)
    local look = camera.CoordinateFrame.lookVector
    local look = Vector3.new(look.x, 0, look.z).unit
    local lookY = math.atan2(look.z, look.x)
    --print("Look", look)
    local difY = restrictAngle(lookY - lastY)
    lookY = restrictAngle(lastY + difY*delta*smoothness)
    lastY = lookY
    PositionIcons(look)
    for unit, rot in pairs(units) do
        rot = restrictAngle(lookY - rot)
        if math.sin(rot) > 0 then
            local cosRot = math.cos(rot)
            local cosRot2 = cosRot*cosRot
            unit.Visible = true
            unit.Position = UDim2.new(0.5 + cosRot*0.6, unit.Position.X.Offset, 0, 3)
            --print(unit, unit.Position)
        else
            unit.Visible = false
        end
    end
end

Here is the function to place the icons in the compass GUI:

local function PositionIcons(look)
    for WaypointIcon, WaypointPosition in pairs(WaypointPositions) do
        local difWaypoint = math.acos(WaypointPosition:Dot(look)/(WaypointPosition.Magnitude * look.Magnitude))
        local lookY = math.atan2(look.z, look.x)
        local rot = restrictAngle(lookY - difWaypoint)
        if math.sin(rot) > 0 then
            local cosRot = math.cos(rot)
            WaypointIcon.Visible = true
            WaypointIcon.Position = UDim2.new(0.5 + cosRot*0.6, 0, 0, 0)
        end
    end
end

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The icon for GasStation is shown properly but as you can see the shop icon is on the right, while it should be on the left. Book and sign seem to be close to GasStation but they are far away on the right.