Cant set custom DC

In the DND 5e (Roll20) character sheet I am attempting to add a spell to a character sheet from a magical item that has a custom DC, however when trying to do so won't let me change it and keeps changing back to SPELL rather than FLAT, same goes for when I try to change it on top (as that seems to determine what DC it is) I had dragged in the spell from the compendium and only trying to change the DC Here's a gif of what issues I am having <a href="https://gyazo.com/15dde1fc3ac929c6e6378601c6ee223c" rel="nofollow">https://gyazo.com/15dde1fc3ac929c6e6378601c6ee223c</a>

Yep, I'm seeing the same behaviour. If anyone else can confirm, it should probably go in the 5e sheet thread. It's also changing the attack stat field. I don't remember it doing this before, but maybe it always has? I guess the save DC is always set by the same stat as the attack. I can't think of any exceptions anyway. The DC does actually stick, if you set it to flat then enter a number, but the display is flicking back to SPELL.

Maybe I should try posting this in Bug Reports and Technical Issues?