Odd behaviour with Help > Dorico Help

I am presently experiencing some weird behaviour with the online Dorico Help.
The sequence of screen shots show what’s happening - please any ideas on why - and importantly, how to cure?




Many thanks

I find it quite confusing so I’ve saved this to my Bookmarks:

https://www.steinberg.help/r/dorico-pro/5.1/en

Is this where you began?