There is a slight, but glaring bug in the UI that is distributed with WiX v2.0.3309.
If you have customised your own UI by darking an existing WiX-based MSI you'll need to hunt for the "MaintenanceTypeDlg" and look for these elements:
<Control Id="RemoveText" Type="Text" X="60" Y="138" Width="280" Height="20">
<Text><![CDATA[Removes [ProductName] from your computer.]]></Text>
</Control>
<
Control Id="RepairText" Type="Text" X="60" Y="191" Width="280" Height="30">
<Text><![CDATA[Repairs errors in the most recent installation by fixing missing and corrupt files, shortcuts, and registry entries.]]></Text>
</Control> Simply switch the Y values of each one to fix this minor bug:
<Control Id="RemoveText" Type="Text" X="60" Y="191" Width="280" Height="20">
<Text><![CDATA[Removes [ProductName] from your computer.]]></Text>
</Control>
<
Control Id="RepairText" Type="Text" X="60" Y="138" Width="280" Height="30">
<Text><![CDATA[Repairs errors in the most recent installation by fixing missing and corrupt files, shortcuts, and registry entries.]]></Text>
</Control>