# Differences in reference allele counts?

**URL:** <https://discuss.gnomad.broadinstitute.org/t/differences-in-reference-allele-counts/470>\
**Category:** Methods\
**Created:** [October 8, 2024, 10:27pm UTC](https://discuss.gnomad.broadinstitute.org/t/differences-in-reference-allele-counts/470 "2024-10-08T22:27:44Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![calbors](https://sea2.discourse-cdn.com/flex016/user_avatar/discuss.gnomad.broadinstitute.org/calbors/32/183_2.png) [@calbors](https://discuss.gnomad.broadinstitute.org/u/calbors)\
**Post date:** [October 8, 2024, 10:27pm UTC](https://discuss.gnomad.broadinstitute.org/t/differences-in-reference-allele-counts/470/1 "2024-10-08T22:27:45Z")

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I’ve noticed that two SNVs at the same position can differ in their reference allele counts (see, for example, [this one](https://gnomad.broadinstitute.org/variant/1-55051215-G-A) and [this one](https://gnomad.broadinstitute.org/variant/1-55051215-G-T?dataset=gnomad_r4)). Why does this occur?