That is odd, maybe try reviewing it to get their attention for your web, plus on my screen it comes out regular, like how you said. Maybe try using it online or try using the app to see if it has gotten better.
I believe it's the timeless of the message because, it depends on how much you've written. For example, Amanda wrote a 7 paragraph long essay, and took at least 2 1/2 hours to read it. This is an example to prove that no matter how much you've written your time to read cannot always be timeless!!! Hope this helps!!!