Change quotation mark from ” ” to ? ?

Your site shows the language attribute as “es”, which is Spanish, but perhaps you need to select a more specific language for WordPress since there are differences (as you have found).
This is from Wikipedia:

The angled quotation marks are more common in Spain than in Latin America, perhaps because they are used in some other Romance languages such as French.

I know there are choices for different English (US, Canada, Great Britain, Australia), and I think there are similar for Spanish.

Hi Joy. In that case, how can I change the language of my wordpress instalation? For the records, I’ve been using wordpress in spanish since day one with no quotation mark issues at all.

I asked around about the translations changing, and Felipe Ella said

It seems it was changed in 2019-04-24: https://translate.www.ads-software.com/projects/wp/dev/es/default/?filters%5Bstatus%5D=either&filters%5Boriginal_id%5D=40297&sort%5Bby%5D=translation_date_added&sort%5Bhow%5D=asc

One of the polyglot team Yui ゆい says for choosing a language

Dashboard – Settings – General, you can add another )(site default) language, if language been added once, you can set it in your user profile. You may need to fetch translations after adding language by using a button in Dashboard – Updates – Update translations

Thanks a million Joy!!! I managed to change the language from spanish to english and it changed the quotation mark ??

Choosing English changes other things though, doesn’t it? Now the Blog page shows the next page link as “Next” in English instead of Spanish. And any other front facing things like “Search” or text on the 404 page is in English. It would affect your plugins also, I would think.
I thought you would choose a different Spanish, not English. There are at least 8 from Latin America, in addition to the one you had before from Spain.