I just tested and it's working correctly on all cases: web, mobile, email client in all of these the divider it is shown correctly. Can you check if your template has been saved correctly? if you copy that campaign and go on template step what you see? can you try to send again campaign with divider and check ?
i did this but i still dont see the divider is er something else i have to do if i kopy the template i see the dividers but afters sending ther gone and only in mij mail account