Hi Xaime,
Thank you for buying our theme. We hope it will meet all your expectations! 🙂
You did the right thing. My best guess is that your issue might probably be related to the cache. Please make sure that you have the latest theme version and that all recommended plugins are up-to-date. Then, you can clear all activated caching system as well as your browser cache before investigating any further. If you want to read more on what browser cache is and how to clear it, here is an article that might help you: How to Clear Internet Cache in Every Major Browser.
Concerning the Login and register buttons, the background colors of the primary and secondary buttons will be used. In case you would like to hide them, you can do so in Customize > Appearance > Login.
Please be aware that to reduce repetition in CSS, and improve powerful runtime effects like theme switching, we use variables to customize our theme. This is why the colors set for the primary and secondary buttons will be re-used in different places on the website.
If you have further questions or requests, feel free to create other forum topics.
Kind regards,