Why am I seeing all sellers as FBM ?
You might run into a case where all the Sellers on the stock checker show up as FBM. This is caused when the delivery address on your browser isn't set properly. AZInsight will attempt to set it to a default value (90210 Hollywood, CA) for you automatically but it might fail.
Solution: The current fix is to manually change your delivery address to a local address on your browser by following this guide