Okay, so I have figured it out. When you click to add something, the current script searches for all scripted objects within range, and currently by default that is actually set to 16 (not 32 as I had thought - seems Second Life only just updated to that)
But anyway the issue is that if you have any scripted objects near those will all be counted even if they are not products or not even things that start with "SF "

Unfortunately you can use 'wildcards' in the sensor (such as search for anything starting with "SF") so it's a limitation of the system.

What I will try is to add an option so you can select to have the storage work only scan for items it contains. This should work fine if you just have a few things but may not work well over a certain amount. This will definitely start off as a beta thing!

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