blog settings, date, theme

you can help us,
We are finishing a website and we have some problems with these issues

we have several blog format sections

1. problem
The date that we put in the news does not appear the same on the website, it seems that the initial date that we put in the first time is saved, later if you change it you ignore it
(Attachment screenshot)

This did not happen with Joomla 4, this website is the first with Joomla 5 that we make with Gridbox

the category list layout or single post layout, the same layout-template activated does not appear,
We go to settings and we have the same theme activated
I don't remember if it was possible to have the same one or did it have to be duplicated and have another separate theme?

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