Both the MK2 (radar and roboport) icons have a sort of size/offset problem. When you look at the png files for the MK3s, the structures have a certain size. But with the MK2s the structures are much bigger and so when the game crops the file data, it only catches a portion of the actual structure.
If you look closely at the MK2 radar icon, you see that that little red line is actually the top of the radar dish. And the MK2 roboport icon is seemingly the top left corner of its png.
I've been told it's an easy fix, but I know little about modding and even less about graphics. And since it seems like Lingo93 no longer supports this mod, it appears this will not fixed.