Thank you for reaching out to us. It appears that your most recently created email was composed of images. When it comes to an image, the recommended width of an image is 600px or less when uploaded to the library or inserted into an email. Sometimes if an Image with text is larger than this, there can be condensing which can make the text look smaller.
As for borders, there is a way to delete them. By the looks of that most recent email, the gray border you are seeing is related to a color setting in the template. Changing the Inner Border color to white will make that disappear. You can access your color menu from the left side of the template when saved out of all of your blocks.