Error with initial loading web

Hello, good morning everyone!

First of all I hope everyone is healthy and well 🙂

I have a little problem on my website.
In the first load, the whole web is moved to the left and without the styles loaded (I think).

I share with you a screen recording and the web: http://www.sandraalguacil.com
Screen recording: https://sandraalguacil.com/web_sandraalguacil.mov

Thank you!

The page I need help with: [log in to see the link]