Sydney theme replaced on iPhone by something else

Have selected Sydney as the theme for my new website and was thinking of upgrading to Pro once I’ve checked everything works out ok with the free version.

It seems to work fine on my laptop and iPad but when looking at the site on my iPhone and my wife’s iPhone, the sydney theme is replaced with a basic blue headed theme. Website is I’ve cleared my iPhone safari came and still get this blue theme.

Not sure if this is a feature thing I need to setup correctly? Or perhaps an issue with my host? Anyone here seen something similar on the theme side that I can correct in my setup? Thanks in advance all.

Sorted. Turns out I needed to Purge SG Cache to get it to work. All visible now.