Its because this is a for with no condition.
The eventsheet execute all conditions and actions every tick.
And you have not set a condition to execute this for, you are just saying execute this for. Yes, it is executing it, every tick.
Edit:
Try adding a button and set the condition:
On button click -> for 1 to 10.
It will execute only when you press the button.
Edit2:
Or add the condition:
On start of layout -> for 1 to 10 (So it will run only once on start of the layout)