For example:
If you look at these two uORF_IDs:
ENST00000307677.4.uORF_ATC.5
ENST00000422920.1.uORF_ATA.4
They are annotated with the same start and end coordinates, but different start codons (ATC / ATA).
start_codon chromosome strand start_coordinate end_coordinate
ATC chr20 - 30310422 30310094
ATA chr20 - 30310422 30310094
Also, looking at the region I cannot find either start codon in the hg19 reference.
Reading the reverse strand starting at chr20:30310422 gives ATG