Plugin out of control

Hello.

I have designed my website using Elementor on ASTRA theme.

I am having trouble with a couple of plugins, I guess…

I am using the TESTIMONIALS plugin from HTMega Addons, and randomly sometimes it is ok, and sometimes the photos sizes go crazy big.

I though it would be only because I was previewing the website, but now that I have just launched it, it still happens!

Also, the headers sometimes are also messed up. I have transparent header on the Home Page, and Black headers on the rest of the website.

Below are the links to the photos of both issues.

Thanks for your help!

Juan

https://drive.google.com/file/d/12QHV_EA2JfXC39qaR9rSppbeX3XAYjPp/view?usp=sharing, https://drive.google.com/file/d/1a09bp4gHjM0cQvntMIBs9SChbDnlfV8_/view?usp=sharing, https://drive.google.com/file/d/1fDtVCi-iaPQbdeQwuVzt9VudM-P5TQqR/view?usp=sharing, https://drive.google.com/file/d/1rMlaEbUHVllyWZSnPJTu-L1Cu7is6OFw/view?usp=sharing

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