in some references of NCBI, for example Sars-cov-2: https://www.ncbi.nlm.nih.gov/nuccore/NC_045512
some CDS are represented as: join(266..13468,13468..21555)
What does it means? The product is a protein where the it looks like the nucleotide at position 13468 has been used twice. How is the correct interpretation?