As seen in my former post
https://forums.autodesk.com/t5/inventor-forum/some-parts-are-partially-see-through-in-ipn-and-idw/m-...
Some parts gets opacity set to 50% without me selecting it.
I thought that I had made something myself at first but couldn't get the opacity to go away when it occurred.
Let me explain by showing what I've found.
When making a .ipn and moving things around...
...if I drag a part/ via the "plane symbol" everything is fine.
If I drag via the "3D symbol" the opacity sets by itself.
And when the opacity get set I cannot set it to 100% to get rid of the see through properties.