exactly, you are of course a producer when you are, as you state correctly, delivering back to the grid. But, that is from the power company’s point of view, and they don’t care if you have true sensors in your HA that are the real producers… and have to make a logical distinction between that sensor, and the returned to grid energy that has taken into account that production and substracted that from the total usage…
and yes, creating a negative value would also be better. right now you choose the third best option I fear. Colors are always customizable, so that could be left to the individual choices.
but hey, its your card… 
Thought as much, thanks! but, tbh, can’t imagine that happened yesterday… but will have an extra eye on that to check if this shows the real situation correctly. In an all grey and rainy day, my house almost always consumes more than that tiny fraction of solar power :-((
otoh, if your card shows me that right now, that would be all the more valuable information.
you really should have a look at this thread, talking about insight in power consumption… so cool.
EDIT
also have a look at this graph, which shows tin another way. Export (returning to the grid, production in your card) being the total of the real production minus self consumption.