I've updated to the latest version of the IOS app, and it's changed the appearance of one of my custom highlight styles.
It seems to change the appearance only, as when I checked my Logos 5 highlights palette, my custom highlight style is displaying as it should do - white text against a dark background. (The iOS app is now displaying black text against a dark background, which makes it quite hard to read!)
Logos 5 Palette [as highlight should look - "Boxed Text" highlights]:

As my "Boxed Text" highlight style appears on the iOS app:

I noticed this first happened on my iPad, and as soon as my iPhone updated to the latest version, the same thing happened.
Not a huge problem in the grand scheme of things, more a mild - moderate annoyance! 
Wondering if anyone else has experienced anything similar...