Hello, Riziq,

According to the attached picture, it seems that you have CommandBarDropDownButton in RadCommandBar and RightToLeft = True. I was able to observe the same issue with the arrows in the Office2010Black theme. This is why. I have logged it in our feedback portal by making this thread public. You can track its progress, subscribe for status changes, and add your comments on the following link - feedback item.

I have also updated your Telerik Points.

Currently, you can change the position of the arrows by using the AngleTransform property. Please refer to the following code snippet:

Public Class RadForm1
    Sub New()

        ' This call is required by the designer.
        InitializeComponent()
        Me.CommandBarDropDownButton1.RightToLeft = True

        Dim item1 = New RadMenuItem("Item 1")
        Dim item2 = New RadMenuItem("Item 2")
        Dim item3 = New RadMenuItem("Item 3")
        Me.CommandBarDropDownButton1.Items.Add(item1)
        Me.CommandBarDropDownButton1.Items.Add(item2)
        Me.CommandBarDropDownButton1.Items.Add(item3)

        Dim item4 = New RadMenuItem("Item 4")
        item3.Items.Add(item4)
        Dim item5 = New RadMenuItem("Item 5")
        item2.Items.Add(item5)

        item3.Layout.ArrowPrimitive.AngleTransform = 180
        item2.Layout.ArrowPrimitive.AngleTransform = 180
    End Sub
End Class

The following picture illustrates the result when using the specified Office2010Black theme:

I hope this helps. Should you have other questions please let me know.

Regards,
Nadya
Progress Telerik