Not sure why you're using Hype in the first place as this is mainly what it's used for. Hype is for building animated HTML5 (granted you can just use it for static content) but mostly it is to help animate DOM content. I personally wouldn't use it for building a website especially if it's only HTML5.
This is not a preset for Web but the default size for animations when first opened. There are 3 "Web" presets but you have to understand these are not for "pages" but for animations at that size. Browsers almost inevitably have continually changing viewport sizes which is why there are many topics and issues relating to this here.
It's great that you've been a customer for all this time and I'm sure the team at tumult appreciate this. But, as Jim mentioned above. The forum is a place where like minded users offer help and guidance to each other and not a paid support service and even though the guys at Tumult often post here it's again not an invitation to have tailored service by them. They have a means in which to "report an issue" inside of Hype if you indeed have an issue with Hype and the way it's working.
I fear though that some of your posts are down to not completely understanding the software. I don't mean to be blunt but that's only my opinion.
Also, as mentioned previously. There could be many reasons why your document is not acting how you think it should be acting SO posting a document or even a website that you have with the issues and we can better tell what it is that is going on and offer guidance or solutions.