most likely because you are an unlucky bastard miner ... for now.
can you explain it a bit closer? As you see im new to all this mining stuff, I just wanna know if I am doing smth wrong or do I have any influence on my avg speed displayed on the site. I just thought it will be the same both in the app and the site.
This piece of data brings more questions than it answers and I think it could (should) be removed.
I think you can extend the averaging period so that the variance is averaged out and it reflects more closely to what you see on your machine. But what you see on your machine is an instantaneous reading anyway and does not take into account time to submit shares, stales, etc.