This was very.. confusing. I have an idea of what you're going for, but the way you've laid out the information is not conducive to understanding what is going on. My main advice would be to clarify what things are, why they are relevant, and the timeline of events. As it stands you've got a lot of things happening too quickly; moving on to the next thing before clarifying what happened in the first.
What is the "-beta"? Is it a real site, a site that is hidden, doesn't exist, or from another dimension? Why are the people at Site 1 so concerned with it and it's inhabitants, and if it is a real site then what's all the hullabaloo about? What/who are SCP-XXXX-1 - 7? What are -A through -G?
That along with a dire need for better formatting in most of the collapsibles makes this just hard to comprehend. Find what parts are necessary to the story, put them where we can see them and make sense of them, and get rid of the excess. The idea of a site just popping up out of nowhere, or a site being accidentally found via anomalous means has merit, but you really need to condense this.
The psychological evaluation is strangely titled as it seems to just be a report by the guy who found it. And you desperately need to add some paragraphs in the second part. Additionally, logs/reports/interviews are often put in quote boxes with information such as the date, who is talking, etc.
The "Report by Site 1" needs better formatting as well.
