Error 500 on home (root directory)

[MIHSG]

Hello,

I'm working on a 1.7.8.9 version of PrestaShop. Im hosting in an enviroment test server on Hostinger with PHP 7.4.

My problem is that every time that I access to the root folder of the instalation /shop/ in this case I get a 500 error (with no log on the server). 

I was struggling a lot until I shared tested on https://testlocal.ly/ and saw that was able to get the website propperly. Then I checked and I am able to see others parts of the website as /shop/index.php. I tried everithing on my hands and I'm out of ideas. 
Tried also generating new .htaccess (manual editting aso). I activate locale and checked but same, some of my collegues and online checkers when access to /shop/ are redirected to /shop/es/ but not me, still on 500 error.

Tried also with deleting coockies, cache, dns flush.... All i got and was able to lookup on Internet. 

Im in need on some help or ideas because Im not able to get to the point of the error and discover if its just a thing of my computer (that doesnt make sense to me but..)

All help is appreciated. 

[MIHSG]

Looks like is a ISP cache problem. Tried again with VPN and I'm able to access. Thanks for help.