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Every now and then when I am working on a model this happens

them 2 part go see through when i import into UE4

Why has it become a different color and then when I import it into UE4 they are see through can i fix this or is this some sort of bug?

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This usally happens when normals are facing the wrong side of the mesh
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Using the backface culling in the N panel will make the concerned faces transparent (see-through as in your UE4 game engine)
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You can check your faces normals with this option in the N panel. This will show you the normals in the viewport.
enter image description here

To make the normals consistent go in Edit Mode with Tab, select all with A (only the bad faces could be enough), and use Ctrl+N (recalculate), or Shift+Ctrl+N (recalculate the other direction), or select the faces and click Flip directions
enter image description here

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