On the chart you posted, I don't see any buy/sell lines. All I see are the SR dots.
Post your template. So I can see what you see.
It looks at the highest high/lowest low for the number of bars you tell it to analyze. That's how it determines where to place the dots.
Thanks, OK here is a GBP/USD Daily Chart, I have also posted 3 other images showing the settings on the indicator. These are defaults. I have not changed a thing except the alerts.