When you search for a GRCh37 variant, if you click a project then from the project go back to the variant page, it drops the request param (grch37), so then by default tries to search for the variant in grch38.
This will result in either a 'variant not found' page, or displaying of the results for the grch38 variant with that ID, if it exists.
When you search for a GRCh37 variant, if you click a project then from the project go back to the variant page, it drops the request param (grch37), so then by default tries to search for the variant in grch38.
This will result in either a 'variant not found' page, or displaying of the results for the grch38 variant with that ID, if it exists.