Trouble opening HTML pages in IOS 13

Hi Everybody,
I recently purchased an I phone 7 and upgraded to ios 13.
However, I regularly receive the E news papers provided by the RNIB in HTML format and in IOS 12.4 I could navigate from article to article either using the Table of contents or the headings within the file.
But now I find that it will murge 2 articles into one when I double tap on it and yet the file works ok everywhere else ie in firefox and ios 12.4.
Any ideas?
If not what apps can open .epub files or .mobie files that will allow me to open the file and navigate it like using Safri in IOS 12.4 as well as being able to read it in Braille using my Orbit Reader
Finally, how do we use Voice Dream Reader in Braille
Many thanks so much
Chantal