My inquire at 3M got pasted up the ladder. They suggest that I might have applied more than 10psi to the cup which I didn't. They said although annoying it shouldn't affect its operation as long as it's only air leaking.
Okay, lets try that again! Liners are stacked so I grabbed two from the top. Lids are loose in a box so that's like drawing out of a hat. Just using water, the mini-cup leaked so bad this time that it couldn't even push the air from the cup. I even tried attaching to the adapter while leaving the cup loose to self-align itself first but it still leaked. Added a second liner, again no leak. One could cut off one liner at the large point near the lip and just use that with another liner.
Since nobody else here has mention leaks this bad, I can only assume that there are defective lids, liners or cups out there. I did tell them about this bad leak but they haven't replied yet and I doubt if they will.