### Have you confirmed that this issue hasn't already been reported? - [x] I have confirmed in the UCSC browser hub that this is a new issue (required) ### Issue location in assembly chr15_PATERNAL:46874244 ### Description of the issue Seems like clear substitution error at beginning of homopolymer based on element <img width="1340" alt="Image" src="https://github.com/user-attachments/assets/928bd962-7ff3-41cf-9292-9b90ba1bdca2" />