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mobile app must have changed something, but, it's fine now.
I work in IT, and this kinds of things happen a lot - it's call cr/lf or white spaces modification by the app.

Oohh.. 😮thank you, is that something related to the view or lay out of the page?

yes, it is.
In IT, computer programming, we have issues with these "unprintable" characters often because different apps mess with them and cause formatting issues - a very common problem with some apps.