The question is a loaded one… there could be hundreds of reasons. First what campaigns (platforms) re you using to send traffic to your site? AdWords, Facebook?
I would use a platform like usabilityhub.com to test different versions of the top of your page. When I do the “squint test” (push my chair back 5-6’ from the screen and look at the page) I see a big clock and some social icons. I don’t see your headline or your subhead at all. So at a glance… I have no clue what I am looking at.
I love the sticky header and the “menu” at the top, navigation is super easy.
The parallax effect is a bit much for me. But I have a personal bias against parallax.
I would A/B test switching the order of the blocks and get that video up higher on the page. Yes, I want to see Pending in action well before you tell me all about it. A picture is worth way more than 1k words.
The headlines are as big as the subheads so it is slightly confusing when you reach a section i.e. features.
It is a great start, the content is good, but the design may be getting in the way of conversion.
Good luck! Show us v2 v3 etc.