Mikrotik blocks pages

Good morning everyone, I tell you I have some problems with certain pages that Mikrotik for some reason blocks the connection since when I enter from another service the page enters normally this is currently happening to me with the state pages
For example this does not load it stays stuck
online.regionlalibertad.gob.pe

but from another operator if any similar experience they have or any solution related to it worked.

note: I am not blocking anything on my mikrotik

You say something different here.
http://forum.mikrotik.com/t/mikrotik-blocks-pages/173638/3
You do not have correctly configured the devices.

Are you sure it is not site DNS issue?

$ ping online.regionlalibertad.gob.pe
ping: cannot resolve online.regionlalibertad.gob.pe: Unknown host

Cannot be resolved with google DNS:
https://digwebinterface.com/?hostnames=online.regionlalibertad.gob.pe&type=&short=on&ns=resolver&useresolver=8.8.8.8

while regionlalibertad.gob.pe can:
https://digwebinterface.com/?hostnames=regionlalibertad.gob.pe&type=&short=on&ns=resolver&useresolver=8.8.8.8

Better check these things before blaming router and network connection. Regarding why is working on other ISP, maybe its DNS have such hosts still cached.