Hello,
Refer to link. TL137US is wired for a standard residential 120/240 VAC 1 phase 3wire system. The factory wiring is between the breakers and the receptacles. The 14-50R receptacle is the only one of the 3 receptacles that would be wired for 240V by way of a 2 pole breaker. The TT-30R and 5-20R2GFCI receptacles are 120V each and use 1 pole breakers. You would have had to connect to a 120/240V system to get 240V on the 14-50R. We really need more detail on what connections were made and which receptacles you are referring to.Please feel free to reach out to Siemens Technical Support at 1-800-333-7421. We would like to help troubleshoot the issue you are having or provide a replacement unit if necessary
https://www.industry.usa.siemens.com/topics/us/en/talonmetering/literature/Documents/TLXXUS.pdf