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The tube is 3/8" OD x 1/4" ID. The ring (ferrule) is 3/8" ID and fits smoothly and snugly on the tube. In other words, the ring and tube match properly. No, the fittings are not defective in terms...

Nope, it was the correct fitting, 3/8" size, which comes in a sealed plastic bag with all components.

I've been trying to use an Ander Lign compression fitting to connect a 3/8" OD plastic tube to an Ander Lign tee. I tighten the nut very tight, but the tube can still be pulled out of the fitting...