Please Help Beacon Puzzle Covert Dungeon

I am stuck in the covert dungeon on the beacon puzzle. The white lines show where I can direct the beacon to. The purple dots are the movable objects. The yellow lines are the path to other movable objects that don't have anywhere to go. There seem to be three movable objects that don't have a partner to direct the beacon light to.   https://imgur.com/a/GFLqwhV  Does the light always travel horizontal and vertical and in straight lines or can it travel diagonally?  I feel like I am missing something. Please don't be obscure in your answers - I have been at this puzzle for days and I need some help. :) 

I hope this will help you:
https://imgur.com/674729P

Good luck!

The first moving item from the unlit beacon - the grave stone - is opposite to what it should be.

The first moving item I could find from the unlit beacon is a bed. ? 

Judging by the lamps on it, it's rather a tomb than a bed ;) It should be facing the unlit beacon with it's "feet", so to speak...

Judging by the lamps on it, it's rather a tomb than a bed ;) It should be facing the unlit beacon with it's "feet", so to speak...

Thank you. You are correct. I have now solved this. The things joined on the yellow lines were decoys and not used in the solution of the beacon. Again  - thank you big big!!