I keep getting these issues and it seems nobody can help me fixing it

Hi there. I am facing these issues according to Ahrefs and I’d like to know:

1. Why is this happening and my WP did not handle it automatically so these issues won’t come up.
2. How to fix them.

I will show now the issues:

—

– ISSUE 1 –

Duplicate pages without canonical

Issue details

Pages with duplicate or very similar content that don't specify their canonical version.

Although Google asserts that they can automatically choose the best version of the content to show in their search results, it won't necessarily be page version you want to be indexed. That is why similar or duplicate pages of your website must have a "rel=canonical" attribute to instruct search engines to show the most authoritative (canonical) version of the page in search results.

How to fix

Review all the pages with duplicate content listed in this report.

For every page in the group of duplicates, you should pick one canonical version that you want to be indexed in search results. Add its URL to the "rel=canonical" labeling on each page with duplicated content, including the canonical page itself.

1,224 results

Example:

This page	
https://www.neotel2000.com/en/2017/07/
Canonical	Missing
Title	
July 2017 - Software Call Center CRM Centralita Virtual - Neotel
Description	Missing
H1	
Archive for month: July, 2017
Pages that have duplicated elements
Page	
Sales and marketing tools for your SME: the virtual PBX

Canonical	
https://www.neotel2000.com/en/sales-and-marketing-tools-for-your-sme-the-virtual-pbx/Self-reference
Title	
Sales and marketing tools for your SME: the virtual PBX - Software Call Center CRM Centralita Virtual - Neotel
Description	
Sales and marketing tools for your SME: the virtual PBX Software Call Center CRM Centralita Virtual - Neotel
H1	
Sales and marketing tools for your SME: the virtual PBX
Content	
Similar

– ISSUE 2 –

Missing reciprocal hreflang (no return-tag)

Issue details

Confirmation (return) links are missing for the pages declared in hreflang annotations.

If page A links to page B in hreflang annotations, page B must link to page A in return.

If this is not the case for all pages that use hreflang annotations, those annotations may be ignored or misinterpreted correctly.

How to fix

To fix the issue, make sure all the page versions translated or targeted to users in a certain region have the same set of hreflang annotations which includes URLs to all the page versions. This will always provide return links between the alternate pages.

215 results

Example:

Target page		
Neotel CRM

Self-hreflang		en
HTML lang		en-us
Page		
Neotel CRM

Hreflang from target		es
Self-hreflang		es
HTML lang		es-es
Hreflang to target		en
Page		
https://www.neotel2000.com/en/crm/?s=Non-canonical
Hreflang from target		Missing
Self-hreflang		Missing
HTML lang		en-us
Hreflang to target		en

– ISSUE 3 –

Self-reference hreflang annotation missing

Issue details

To indicate multiple language/location versions of a page to the search engines, each language version of a page must list itself as well as all other language versions.

Hreflang annotations without the self-referencing link may be ignored or misinterpreted by the search engines.

How to fix

Review all the pages with missing self-referencing hreflang annotations listed in this report. You can see all hreflang links specified for a given page in the table.

Make the necessary changes, so that each of these pages has a self-referencing hreflang annotation.

For example, a Spanish version of your page must have rel="alternate" hreflang="es" annotation with a link to itself.

77 results

Example:

Target page		
https://www.neotel2000.com/politica-de-privacidadNon-canonical
Self-hreflang		Missing
HTML lang		es-es
Page		
Privacy Policy

Hreflang from target		en
Self-hreflang		en
HTML lang		en-us
Hreflang to target		Missing
Page		
Política de Privacidad

Hreflang from target		es
Self-hreflang		es
HTML lang		es-es
Hreflang to target		Missing

—

A million thanks in advance to anyone willing to help me fixing these issues!