I’ve created a model in 3ds max 2010 and have used the boolean tool to cut the shapes into the model to get it the way I wanted it to look like. once I had finish I exported it to UE4 version 4.4 and the mesh had errors
This isn’t the intended workflow and seems like a workaround for what you really want to do.
Using the Boolean tool is more than likely the root cause of the issue. I’ve seen this cause issues for users before especially if you are not going back to edit the geometry to triangulate or quad your object faces. This can cause faces to invert like you have above.