In some cases we prevent certain users from accessing specific offers. You may be able to see an offer, but not access it.
Usually this is because the advertiser has requested to be excluded from certain traffic types, or to proactively protect the advertiser from potential fraudulent activity. It's nothing serious and does not signify anything about your account.
Our advice is to move on to offer walls from our other network partners, who may not have such restrictions. Check the navigation bar in the account area of our website to do this.