my url get the word PORTFOLIO and I do not understand where it comes from or how I can remove it. Can you help me?

The correct url should be: paddock-news.es/mecos/plegado/utillaje-para-plegadora

But when I click on the menu I get these examples:
paddock-news.es/mecos/portfolio/plegado/utillaje-para-plegadora
paddock-news.es/mecos/portfolio/portfolio-3/rectificadoras-de-utillaje-para-todo-tipo-de-punzonadoras

what is PORTFOLIO? why I see this word? what is the meaning?

It's in all child menu items. I revised items, categories and menus but I don't find out why this word is shown.

the site is off line, paddock-news.es/mecos/ user: admin and pasword: mecos
Thanks,
Nuria

If you are using K2's advanced SEF you need to revise these settings.
If not, then another extension is adding this suffix.