Why is google indexing pages NON SEF?

Hello guys.. Im noted recently that google is indexing some pages from my website aulapro.co, that when you click their link on the google results it sends you to a page that has a NON SEF URL.

For example thisn one:

Try to search this on Google:

Que es Finsta

I think that you could try to put the word Colombia or AulaPro, so that way maybe you could reach the results located in colombia.

Anyway a let you the Google Results URL here.

https://www.google.com.co/search?biw=1366&;bih=662&q=que+es+finsta&oq=que+es+finsta&gs_l=psy-ab.3..35i39k1j0i10k1l2j0i22i30k1l7.6988.9706.0.10275.13.12.0.0.0.0.299.1726.0j7j2.9.0....0...1.1.64.psy-ab..8.5.858....0.DWsirUjgEew

Like in the middle of the first page of results you should see the result from my website Aulapro.co like you see in the image i send you here.

This results links to the following URL:
https://aulapro.co/index.php?option=com_easyblog&;view=entry&id=508&Itemid=1143

As you can see the url is non sef...and if you take a look in the google results, theres some kind of warning about AMP implementation.

Why is showing this non sef page on results? and what could be the AMP problems?


Hope can helpme.

Best regards.