Problem with plugin and .htaccess file

So I had some problems with my blog so I backed up my DB and reinstalled WP, put back DB and plugins and started reconfiguring my blog.

My 2 problems are: Before the install in the .htaccess file I had

RewriteEngine On

RewriteCond %{HTTP_HOST} ^alexamarandei.ca[nc]

RewriteRule ^(.*)$ https://www.alexamarandei.ca/$1 [r=301,nc]

Now if I put this and I try to click on any post it tells me 404 not found. To fix this I have put the following code
“
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress
“

And my second problem is with Socialize plugin.

Do you see any difference between https://alexamarandei.ca/dupa-o-zi-de/ and https://alexamarandei.ca/criza-peste-tot/ ?
And yes I know the picture is missing from the second post. It’s the buttons that differ from post to post. Like for example from the last one vs the second one.
It seems that if I have a real image the buttons display ok but if I don’t like here: https://alexamarandei.ca/de-ce-sa-nu-iti-alegi-hosting-la-2-dimineata/ it uses another type of script to align them ?