For some reason this code shows up in between each of those divs in front-page-12 when I check your source code. See line 319, 329, and 339 – view-source:https://karendoniere.com/
Did you add that in directly? If so, you can remove it and everything should align.
To reduce the content on your blog summaries, go to Genesis Theme Settings and look at the Content Archives section and you can set a content limit from there.
Also, you have <strong> in those sections that are showing up as bold, so that’s why it’s showing up like that.