No, quite the contrary. Some users run 2 analysis in a day, and see no problems in using labelled vessels. Absolutely in both cases. Damaged vessels will most probably result in very different results from different vessels. The vessels must NOT be damaged in ANY way otherwise one cannot trust the results.
Some suppliers have their paddles ready-labelled on the shaft.
This is not the case for screw-on paddles. They are not selling to the US-market. Other users perform parallel analysis of old and new batches to check for differences. If new calibrators fail as well, a complete check of all physical parameters is performed and preferably also a cleaning of the system. A new batch of calibrators are used to test the hopefully now clean and adjusted system.