When deleting the translation the homepage setting changes from a Static PAge to Latest Blog Post.
Solution:
I've found out that the issue of the homepage that is being charged to the latest posts after deleting the translation of it, is an issue that we are aware of. In fact, we have a warning if you try to set a static page to be the homepage and it doesn't have a translation. This warning is showing if you try to set this in Settings -> Reading. This is the same setting as in Appearance -> Customize. But the problem is that in Appearance -> Customize the warning does not show. Therefore I escalated this issue to our second tier supporters and asked to report it to our developers.
Meanwhile, as a workaround, please avoid setting a homepage that has no translation, or set it back to that page after deleting the translation.
Some of the Astra options (Astra settings on the editing screen of the page) were set to 'Don't translate' and this caused the issue. Here is what I did to solve it.
1. I scrolled down to the Multilingual Content Setup section
2. For the Custom Fields, I pressed the Show system Fields link.
3. Then more fields' settings are revealed.
4. I checked the 'Copy' option for all those fields and pressed the 'Apply' button.
5. Then I made a small change in the page (just added a dot or a comma) and updated the page.
6. Then I updated the translation to 100% complete.
And now the transparent header and other settings are showing correctly on the English page.
