A glitch on my miracle coaster?

When I try to fill in the station roof with catwalks it seems to erase one piece as I put in another piece. It is a glitch in No Limits? I had to fill the empty space with supports.

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[hyyyper]

weird, have you tried it with 6 separate wooden pieces?

I had to insert wooden pieces to fill in the gap between the top of the roof and the bottom. Do you like my miracle coaster?

[hyyyper]

^Oh, wait. I see your problem. Your roof consists of a very flat cube. A cube has 6 sides. Now, if you only fill 4 of those sides, as you did, there will be gap. If you use 2 other catwalk pieces you can fix it.

EDIT: here's picture:


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Well I had the top and bottom, front and back and one of the two sides installed when the glitch happened.

[hyyyper]

that's odd, i have no idea on how to fix it.

Well I almost done with the miracle jet coaster.