Yes, the tube only contains 19 rounds. This is normal! Also, please know that individual rounds sell all the way up to $23 each. Buying this brand new, completely untouched, and SEALED tube is an absolute steal. Currently priced at around $10 per round, shipped.
The Schloss Guldengossa 2010 1 AVDP oz .999 Fine Copper Round sealed tube is a high-quality investment product produced by Geiger Edelmetalle in Germany. This tube is sealed with the original mint's tape/seal and contains 19 rounds.