I've created a webapp that works smoothly on the majority of mobile devices. However, I've noticed that occasionally on my iPhone 5s (and I've heard similar experiences from users on other iOS devices), the text appears blurry. This issue seems to happen inconsistently, happening on pages where it hadn't occurred before and not happening on pages where it had.
I've searched online for an explanation but haven't found anything helpful.
Does anyone have any insights into what might be causing this?
Here's a screenshot of the issue: