Hi,
I am not sure, what you mean by "scientific reason", but what I can offer that if you have a proper tracking on your sites and you share it with me, I will look into it, and try to figure out what is causing the issue which you are struggling with.
If you don't have any or thorough tracking set, then it is a bigger project, which I can also help you with, but the given bid doesn't refer to that.
Thanks and regards,
Eszter