Only part of my website title shows up on the navigation bar when I type in my website into the browser

Hello everyone

My website URL is www.robynsarahstocker.com and until recently it showed up as Robyn Sarah Stocker on the browser when visiting the website. But for some reason it’s now only showing up as Sarah Stocker.

Any idea why that’s happened? The only thing I can think is that my tablet had a recent iOS update.

Thanks in advance!

Update: Strangely, it’s now showing up with the full title so I’m baffled as to what may have happened!