I have set of gene symbols. when I convert such symbols to appropriate ensembl gene ids, it gave me different gene ids for a given gene symbol instead of one gene id for a given gene symbol. why is this happen?
The gene you're looking at, AGPAT1, is found on a haplotypic region. Haplotypes are regions of the genome which have two or more versions, which we find in full in different individuals. These may have the same genes in a different order, or even different genes. We have a help video explaining this here.