I have Bard with Dissonant Whispers as one of her known spells and the "Show Level-Scaled Spells" option activated.

Today, when reaching level 5, I've noticed that on my 2nd Level Spells, the damage for upcasting Dissonant Whispers appears as 3d6 instead of increasing to 4d6 as it should.

Dissonant Whispers

 

You whisper a discordant melody that only one creature of your choice within range can hear, wracking it with terrible pain.

The target must make a Wisdom saving throw. On a failed save, it takes 3d6 psychic damage and must immediately use its reaction, if available, to move as far as its speed allows away from you. The creature doesn’t move into obviously dangerous ground, such as a fire or a pit. On a successful save, the target takes half as much damage and doesn’t have to move away. A deafened creature automatically succeeds on the save.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d6 for each slot level above 1st.

Other spells that can be upcasted, such as Healing Word, are showing the increase correctly.

I tested rolling the damage, just in case the error was only visual, and the damage was also rolled as 3d6 instead of 4d6.

Post the url to your character sheet so someone can take a look.

I'm not replicating the error myself, so I wonder if your spell is an incorrectly-coded homebrew of Dissonant Whispers. If you look at the spell description on your sheet, and it has a Version: field, then it's homebrew.

Turns up it was homebrew, although I'm not sure where it was coming from because I had no such spell in my homebrew collection and I have this character in a campaign with all sourcebooks shared.

But, yeah, regardless of that, I've been able to remove the homebrewed spell and select the official one and now the upcasting damage shows up correctly.

Thanks!

Someone else in the campaign must have it in their collection. All homebrew in everyone’s collection is automatically shared within campaigns.