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Could just be the data, in that there is one extreme value (37,461) which is how Tableau sets the Colour Range, and with 15,000 being the center any numbers below that will be (various shades) of grey.
If you have an extreme outlier...eg. all values are between 27 and 200, with one value at 37k...then set the Fixed End to something like 250, so everything 250 (and over) will just be the extreme red. Alternatively there are colour pallets (or use the Log of the measure on the colour shelf) to handle extreme outliers, where you want to show how extreme they are.
Let me know if that doesn't do the trick
My initial thought and question would be is there a reason why you need to set "fixed" values at the end and start? Would it be sufficient to uncheck these boxes and let the values dynamically adjust?
Sorry for the delay in getting back to you. This was my initial thought, however, the data is evenly distributed between 200-3000 so colour should be evenly spread out.
The colours don't just automatically even when the box are unitckde
Are you able to post an anonymised version of your workbook (here's a quick video on how you can do this easily) Anonymize your Tableau Package Data for Sharing
I can then take a look.
Usually you just drag your field onto the colour shelf and Tableau creates the pallet from the 2 ends of the range of data (which is why extreme values can mess this up).
Cool! One way to quickly pick this up would be to add the colour measure (a second time) onto Size....this means the outlier would come up as a huge red dot!
To make things dynamic there are various ways (eg. Standard Deviations) to pick up and handle outliers, and then use the "handled" field on the colour...but if it's doing what you need, no need to dig further!!