It's not that it's wrong but all imaging techniques have limitations. I would try to get your doctors to do a MRI or at least explain why they are comfortable with what data the CT has provided. If they're happy, at least let you know why, they work for you.
CT is usually pretty good at detecting pancreatic cancer, but like any imaging test has its limitations. If your symptoms persist, consider MRI/MRCP abdomen with and without contrast, which is more sensitive. Discuss with your doctor :)
The CT scans I had showed something in the pancreas. It took ERCP with biopsy to prove what the shadow was, an adenocarcinoma in the head of the pancreas surrounding the bile duct. I was diagnosed at Stage IB on 14 May 2015.