Ok, so a few things:
I just did a quick forum search with this issue - the AddToAny buttons not working on mobile, and it seems a few other people have run into it as well, determined it’s not compatible, and have possibly found a workaround:
Not sure what your goals are for your blog, but if you plan on creating many different posts with different content, then I highly suggest building out a single blog post template page that can then display your dynamic content (your posts). Right now, you have static text on this single post page that’s built specifically for this content. You’ll save yourself a lot of time and effort if you built out a template for posts and then send the post data to the page so that you only have a single blog post page and not a separate page for every single post.
For example, the big text element would just hold the dynamic text tag for content that is stored in your database instead of the content being in this element. Again, this might not be what you’re after, but thought I’d make the suggestion in case you are going for a traditional blogging site. Also would suggest doing some of the Bubble lessons on saving data and sending data to pages. For a blog, you’d have to create a CMS for yourself where you can type in your blog post in a rich text editor, save it to the database, and then be able to retrieve different posts on a single blog post page.