All mobile browsers are fighting for page display speed. Because of this, many data, style settings, html code, and even interface elements are stored in the device's memory.  Because of this, with any changes on the site side, the user will see outdated data for months.

About how to clear the data, I show on video. But, and if you already know where to click, read on.

To clear the data, you need:
1. Open the profile in the lower right corner.
2. Open settings.
3. Open Security.
4. Clear the data.
5. Additionally.
6. Cached images and files.

And if you need to quickly view the site without all the saved data, use incognito mode.

This guide was written for the mobile version of the Opera 75.3 browser

Have you been looking for a long time how to do this? Yes, the button is hidden nowhere else. Thank me for the answer in the comments.