Transparent border on GUI bug?

Last update adds a transparent border sizes if you specify:

Code:

{
   ""type"":""RectTransform"",
   ""anchormin"": ""0 0"",
   ""anchormax"": ""1 1""
}

How can I fix it? Would it be correct developers rust?
[DOUBLEPOST=1447169946][/DOUBLEPOST]http://i.imgur.com/MT4ztmM.png

 

Perhaps is it in relation to this Available new UI overlays? | Oxide