Can someone help me with this MCE Mystery?

I was working on a level where I used a bomb crate with fourteen turtle shells in it.
When I tested the level and opened the crate, the Jazz 2 logo came out of the bomb crate, 14 times.
You can get this MCE when you set the pulse speed of a generator pulse light on 41, wich is the event number of the turtle shell....

But now it is getting really weird:

Then I placed a turtle shell a few tiles away from the crate and ran the level.
When I opened the crate, 14 turtle shells came out and the turtle shell a few tiles away was dissapeared!

Does anyone understand this?