HGG Community Forums

I'm not sure why this is happening. I want to modify this filly's genes so she has KIT M on her sire side of the KIT allele, but the gene lab won't let me add it unless I first change TO to W8, then change W8 to M. I did it that way, then refunded both edits and tried again, but when I select sire side under KIT allele and it brings up the available options, the only options I'm given are W8 and W20.
This is the filly I'm trying to modify:

2G KIT 18451137

Here's the link to the exact page that I see: https://www.huntandjump.com/gmt.php