Site fonts & settings changed without me doing anything

Hi all, 
I had almost finished my site (trial period) and then lots of the settings changed without me doing it. The website width, some font sizes/styles (some fonts even bolded), format of photos, etc. My whole website went from unified, looking beautiful to every page now having a glitch and looking differently to how I had it. I haven't touched anything in the backend. Was just adding text content and photos today. If anyone has any ideas of what's going on please let me know. I'm totally confused and would love it sorted as its messed up each page of my website. 

Hi. You try contacting Squarespace Customer Care (Livechat/Email). https://support.squarespace.com/hc/en-us/requests/new?_ga=2.91312414.507963140.1592726604-1526093068.1592726604#choose-topic