Try this, in the LAYOUT PROPERTIES window, look for "Unbound Scrolling" and put a check in it. Then run your project. If it does what you want, then your layout is too small vertically for what you are trying to do. For scrollto to scroll to the position you are trying to scroll to, the position needs to be <= the height of the layout - the height of the window. If that doesn't work still, we would need access to your project to find the problem. A screenshot of your events isn't enough information.
Plus, you can reduce your events/actions for setting the position to a single event.
+ System: Every tick
-> System: Set scroll Y to 100000 × Variable1 + 500
Since you already have an "Every Tick" event, if you put the single scroll action into that event, these 8 events would become 2.