You don't drop them on the weapon rack. =/
1. Equip a weapon.
2. Hold it in your hand.
3. Use the weapon rack. It will fill from left to right.
No, lol. I have done it exactly like you said. I explained two problems I am having.
1st: I equip a weapon, approach the rack, press a and x, and nothing happens. At all, whatsoever.
2nd: When I put things on my tables, they reappear on the ground when I re-enter my home. In order to put things on your tables, you must first drop it, correct? Okay, what I am telling you is that once I pick the item up and place it on my table, exit the house, and re-enter, the item(s) are exactly where I dropped them instead of being placed neatly on the table where I put them.
Does that make more sense? I am not trying to drop the weapons into a rack, lol.