@thefinal The hose from the dust collector is not related to the vacuum holddown for the table. Whoever disconnected it should have reattached it. Thank you for doing so.
If you look at the piping at the rear of the table, you will see a large white pipe that connects to a grey pot with 4 holddown clips. Inside that pot is a filter that is there to keep dust from fouling the blower impeller. The gasket on that pot was not in place. It is possible there was enough leakage around the lid to cause the low flow of air through the table that you observed.
That said, there are other possibilities. For things to “stick” to the spoilboard, you need a good seal around the edges of the item in question. If the spoilboard has gouges, even small grooves, largish dust/grit particles, etc. to allow a gap between the table and the item, air will leak around the edges and defeat the vacuum holddown capability. Under perfect conditions, the Multicam blower can achieve 6 pounds/square inch of vacuum. Lots of things can and do keep the system from being anywhere near perfect.
As an extra note … there was a note on the table by some gouges cut into the spoilboard that said the table lifted up. Probably happened while using an upcut spiral bit. Don’t think that will happen if you make a habit of running the vacuum blower even when not relying on vacuum holddown for the work piece. Also, it is less likely to happen if work is positioned at least a few inches from the edge of the spoilboard whenever possible.