Hi @miriazab,
Thanks for letting me know about those issues. I also saw them:
1. Custom JavaScript is not allowed.
2. CSS syntax error in tag ‘style amp-custom’ – unterminated comment.
https://validator.ampproject.org/#url=https%3A%2F%2Fwww.adelgazarsinmilagros.com%2Flistado-de-alimentos-y-snacks-low-carb%2Famp%2F

1. Do you have any other plugin related to AMP, SSL or HTTPS? Some plugin is outputting this <script>, which isn’t allowed in AMP:
<script>if (document.location.protocol != "https:") {document.location = document.URL.replace(/^http:/i, "https:");}</script>
Even in non-AMP, it’s usually not a best practice to have inline <script> tags in the <head>.
2. The CSS looks to be coming from this line in the Yuzo Related Post plugin:
https://plugins.trac.wordpress.org/browser/yuzo-related-post/trunk/yuzo_related_post.php#L975
Disabling that plugin would probably take care of that issue, though you’re probably using that plugin for a reason 🙂
But that HTML is still valid (if unusual), and this AMP plugin isn’t handling commented-out inline styles properly.
This looks to be fixed in the upcoming 1.0 release of this plugin. There’ll probably be at least a Beta version in June.
Background
For this markup:
<div class="yuzo-img-wrap " style="/*width: 126.5px;height:88px;*/">
The style rule in AMP doesn’t have a closing comment: */
.amp-wp-inline-a386c318dfa5afbad39334c530575875{/*width:126.5px;height:88px;}