I have purchased the glissando theme, but it seems that there are some informations in sections (like texts and images ) missing in demo. I wanted to look at it on Envato preview, but there is the same problem.
This is probably not an issue we can do much from the theme. My first guess would be in the type of font you’re using. Edge doesn’t support certain types of font encodings and this is an issue pretty regularly brought up on Edge forums.
You may try using different fonts to see if this resolves the issue.