Blogger: Text overlap

The problem is your line height setting.

I don't know if you set it that way in the customizer, or it was already set that way and you changed the font size without considering the default line height. Either way, you need to reset the line height.

You can do that in the theme editor as per this picture. Ideally you should try the link at the bottom for "clear all advanced customizations" but you can use the slider too.

[Image] 

Your font size is 22px so you want a line height of around 20px or more.

If that still doesn't work, use the "Add CSS" section and paste this:

.post-body {line-height: initial;}