Our Bluecup capsules are made from BPA free polypropylene - this can expand a little during use. Whilst this won't cause damage to your machine, they may require a little nudge to drop from the brewing chamber into the drip tray.
As a general rule, a little jiggle with your index finger should usually help to release the capsule. If required, you can also use the WayCap removal method as per attached video. Note: Please attempt this carefully - blunt implements preferred!