The Spur Agent will decide on a rough ballpark amount to scroll the page by based on your prompt. If the prompt was to Scroll all the way to the bottom of the page, the Spur Agent is likely to scroll the page by a larger amount (e.g. the entire viewport)It is currently heavily recommended to give numerical pixel values for scrolls (this will make tests more reliable!)
Use the Scroll Viewport in the Preview Editor to easily determine pixel values for scrolling actions!