No.
Or actually, yes: you have a constant result, so it shows a constant result.
If you are looking for an answer that makes sense, please provide your setup, so we know what you are expecting, what data is being collecting and maybe we are able to help you. Just a graph with a line, asking why that line is like this, provides no information that can lead to an answer.
Please mark any helpful or correct solutions as such. That helps others find their solutions.
Mark
