I also saw that every time I refresh the page, a new deposit address is showed to me. so, are all the address showed exclusively mine or they are just temporary address? if they are temporary, you should say for how long they will be assigned to my account.
Is the user ID the same, just deposit addy changes? If yes, it's probably a Coinroll bug . If the user ID changes every time, then Coinroll can't remember you, maybe you have disabled cookies or there's another problems. Write email to support and tell them your user id and browser.