When you remove an Interface from a pipe it keeps its ID. This fills your inventory up with non-stackable. You are unable to clear them either by placing them into a crafting slot to clear them or just removing them as normal.

The ID assignment is intended. But I could indeed implement ID clearing by placing the item in your crafting grid.

Awesome! It just clogs up the inventory rather quickly when you have multiple ones that you remove from an system. Thanks!

Will be included in next Integrated Dynamics release.