Some offers just take too long to be accepted or rejected

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I just signed up with gptreasure, and I done two offers a day ago, and one of my offer still in pending mode, while the other, the system said couldn't track it. It suggested me to use Internet Explorer to do it over again. It just too much hassle, and troublesome with those cash offers. I had similar experiences with cashcrate and treasuretrooper. After I done several cash offers, some offers accepted, while others just in pending, and it took a while to know whether they are accepted or rejected. Do you have the same experience with those websites? Sometimes, I don't even know what had I done wrong, and it took too long for the offers to be rejected. Any suggestions or advises on completing those cash offers?