How do I destroy overlapping objects while "On Start of L.."

I am trying to re-create a game in Construct2 that I made some time ago.

I am spawning a lot of barrels "On start of layout"; and I want to re-position the ones that are overlapping.

So right now I am doing a while loop that is running until there are X amount of barrels in the game. And inside the while loop I am trying to destroy overlapping barrels. (However the last part is not working)

Screenshot of the game:

How come the overlaps are not getting destroyed?

You can't compare two of the same object type at the same time. Put bomb into a family and change event 3 to:

bomb is overlapping BombFamily -> destroy bomb

(You don't need a fourth event).

Thanks blackhornet !

It worked perfectly.

(Any explaination as to why this works like it does?)