Page can't be displayed due to blocked resources

Hello,
I am new to the forum and new to Mikrotik as well. Here is my situation…
Three years ago the whole network at a client site was upgraded with mikrotik routers, APs, etc. I use Winbox to run some very basic tasks.
Now all of a suden (since Friday) we are not able to get to a specific bank’s webpage (web banking) from that client’s site (the site works fine from my home and 4G networks). I get the following error.

“This page can’t be displayed due to blocked resources” (attached the message)

Any help would be greatly appreciated!

Jack P.-
winbank error.jpg

Why do you suspect that Mikrotik is responsible for this? Have you checked this page via different connection?
Picture clearly shows message which looks like valid html page prepared by bank’s server. Have you contacted with bank?