Users from Instagram being sent to landing pages with 404

[valleplateado]

I noticed today I had a decent amount of users visiting today but only had about 6 users with a landing page. When I checked, most of our users were from Instagram but their landing page had a 404 in it:

When I check Google Analytics, seems that it seems that many were coming from the /en-mx path, even though I updated the markets a day or two ago to use primary domain.

I now added redirect for the language combos to go to the home page but I am still confused on why this happened? Or is this another issue? I tried myself on the Instagram to click the link but it took me to the regular homepage without a 404 error. I can't find what it was.