Bug after Polylang Installed

Hi There! I use a subscription pluggin that stopped working after I installed polylang.

I currently use 3 languages (portuguese-br as the main language, english and spananish)… after installing polylang I noticed that only when I add posts in english that it triggers the subscription email.

This got stucked in english even after I uninstall polylang.

I also notice that when I write the address of my site, it automatically opens the english version page, which I believe is somehow set at the main language, which is why that is the only language that is triggering the emails.

How can I change that to portuguese so it opens as my main page and triggers the subscriptiomn email only with that language instead of english?

Thx

https://wordpress.org/plugins/polylang/