Issue with legends not updating properly/displaying wrong colors

[Alternatewords]

I am running into an issue with legends not updating properly, at least in my particular chart. I've created an inverted spider chart (0 outside, highest value inside). I just mention this in case it's relevant to the issue.

The chart includes a color-coded legend so all cars can easily be identified by color. The expected behavior is that colors "stick" for whichever cars are being analyzed. Unfortunately, this is not the case whenever we run a refresh. Something odd happens. Now, the first color in the list gets displayed on every car we select. I've attached several screenshots to try to illustrate the behavior (check number sequence in each selection):

The only remedy I've found so far is to edit the chart, change either link color or symbol fill to a different field, save, edit again, and revert. Afterward, it functions correctly - until the next refresh:

In addition, sorting is off and I haven't been able to fix that either. You can see that car #68 is on top, which it shouldn't be in this sequence. Previously it was in the correct sorting order.

Happy to provide further details. Would be great to fix this as I have multiple dashboards for different departments all needing that same spider chart and I can't manually fix this on every refresh.