Red lines on Constructor?

[Stratofortress]

What do they mean?. Also i exported with legacy dif  and it dosent  have collision. Please help

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[Packer]

When you place it into Blockland you have to move it around a bit so the collision gets reset.

[Stratofortress]

txs. also some of the faces wont show eather.

[Mutantz]

red lines are bad,they mean that something is not right,i forget exalcty what it is but i think its something to do with it just cant draw that angle