Formatting issue when going 'back'?

Hi all, bit of an odd one here.

On occasion, when I press ‘back’ to navigate back to the previous page, the formatting of some elements seems to get messed up.

Example below:

Normal formatting

After going back

This happens occasionally and I don’t know why. From what I can tell, it affects the font, padding and margins of text elements.

My default app font is the font that I use (mostly) throughout, so it’s not defaulting to that.

Has anyone experienced this before?

Thanks legends

Edit:
Bad example to use as the font seems okay in this screenshot. But on other occasions it has changed the font too.