When I built mergers close together (they are not intertwined), I can't connect them with conveyor belt. Sometimes, mergers are connecting together but most of the time they aren't connecting together.
In one of the previous versions (I can't remember) I could easily connect to each other. (I built a big factory.) But now I can't. The construction of a huge factory has stopped.
Note: I'm playing with the latest update of the game. Non-experimental (Patch 0.2.1.12 - CL #103400)