Negative values show as positive?

I have a couple of helper entities that show the difference between a couple of other entities. These are being used to determine the “savings” I am making on my tracker energy tariff compared to a standard rate tariff. Given the current global situation, these daily savings are currently negative.

When the entities are reviewed in the Dev Tools → States, the staes show up as negative, BUT if I add them to a dashboard using any card, the value shows up as positive, but drilling into the entity popup, the history shows that these are negative numbers as shown here:

The helpers are set up thus:

Any ideas how I can make these show as negative on the dashboard

This is a bug with device_class: balance (Monetary in ui). It should show ($0.22) for negative values. This was likely never accounted for.

Same problem here. Entity card shows absolute value. Graph shows its currently negative

Looks like this has been fixed in https://github.com/home-assistant/frontend/pull/30178