Imagine that we first have a Player then after 10 meters Object 1 and after 20 meters Object 1 (copy)
When the Player approaches Object 1, then (for example) object 1 must create a new object (for example, object 2) on itself.
And here dances begin with a tambourine, since the object object 2 is created immediately and on object 1 and on object 1 (copy).
i see you have a collision/overlap issue, so what happens is when the player hits object1, object 1 clones himself as a new instance in the same position, position at which the player is already overlaping the object therefore triggering the collision again, and spawns again another object and so on.
try push the player outside the object1 when collision happens even if it's 0.01 pixels outside to it so is not noticed to the player, that should fix your issue.
also make sure you destroy object1 that initializes the new cloned object in the same event action that makes the new object. on the same tick.
here is some pseudo-code
player.oncollision with object1
object1 spawn object1 on self.
player.setX to self.x-0.01
now the above is applying for a sidescrooler type of movement assuming the player moves left and right only. and assuming the player stops the movement at the very first contact with the object1.
otherwise you could add a timer on the object created to enable collision so it's not happening that fast.
think of it like this
if object1 hits player.
object1 spawn object1 on self
set object1 collisions disabled.
set timer to activate to 2 seconds
if timer countdown is ready
object1 set collision enabled.
that should give you the basic idea on how things could work with a delay, so you have time to read the text.
or you could save the position and area of object1 on initial collision then save the position and for the new object say if player is in same area as before don't do nothing.
once the player is outside the area activate object and then the loop of collision can happen again.
hope it makes sense.
if you could share a c3p file would help us understand better your setup.