In iOS Safari browser, navigate to a website for which you want to turn off Reader mode.
Next, in the address bar you’ll see an icon on the left. It consists of four horizontal lines. This is the Reader icon.
You can tap it to turn Reader mode on or off at will.
Long press (hold your finger down) on the Reader View icon.
After a few seconds, you should see a pop-up menu with options to "Stop using on..." the current web site or all web sites. Choose the preferred option.
After you disable it, you should be able to the contents of the website in correct format.