Custom Attack Not Saving

I am trying to create a custom attack for Sharpshooter. I was able to successfully create an offhand dagger attack with correct stats that save, but the Sharpshooter custom attack is not saving. Here is the link to the character sheet: https://www.dndbeyond.com/profile/mattswymer/characters/2615675

Here is what I have done so far:

Here is what appears after I refresh or go to another place and return: 

Any help would be greatly appreciated!

2026 and still seeing this bug in Firefox on windows 11.

No issue so far on Android app.

In windows, the customization will sometimes save but it seems entirely random and not affected by anything the user does.

It's incredibly frustrating and apparently an incredibly old bug. Not everyone wants to manage their character on the smallest screen they own, nor would they necessarily have any reason to assume that they're going to have any better luck on mobile.