strange behavior on our dmz address switch from https to http

Hi group

ebs 12.2.4

while connected on our DMZ server

login working well in https browsing in sourcing responsibility work fine and still in https

if i put my mouse over one of the link for Notes and Attachments the link displayed is https

but when i click on the link address is trying to open a link in http

have the same problem with the link "Return to Negotiations" when consulting negotiations

have another environment that is working without error
compared profile and context file cant see the problem

thanks