WordPress login page errot

Hi.
I dont know why, buy when i go to the login page of my site (https://www.ile-perrot.qc.ca/wp-admin), i dont see any image and the login page dont show as if i using a local computer in my compagny.
If i use a local computer to access https://www.ile-perrot.qc.ca/wp-admin, i can see the wordpress logo and if i’m from the external then the office, the login page is text only.

When i login using the text only page, the text formating is messed up when i try to edit a page. But evrething is ok when i login using a local computer and the normal version of the wp-admin login page…

Very strange.
You can help me ?
Thank you.

The page I need help with: [log in to see the link]