Steps to reproduce:
1. Drop two huggers on a tile (tile #1)
2. Drop two huggers on a tile perpendicular to the first tile (tile #2)
3. Pounce and click on an adjacent tile (tile X) so that you push items from #2 into #1
4. Tile #1 now has 4 huggers
[R][ ][2][ ][ ][X][1]
Basically runner pounces so that the cursor is on X, "pushing" the two huggers on tile #2 onto tile #1 where all four huggers manage to coexist peacefully.
Proof:

Edit:
Carriers can "throw" what I assume is an infinite number of huggers onto 1 tile without any bad effects on the huggers.
