I don’t know if this is a bug, or intentional. When creating presets, the description field in the app is limited to 275 characters which is too low, in my opinion. On web, you can have multiple paragraphs in a description (which I utilise a lot).
I love writing in the description the type of guitar I used, where I got my inspiration from (for clone presets) and so on. I avoid using the mobile app for this reason. And, it doesn’t appear to be a limitation for any technical reason, as my large preset descriptions load fine in the app.