I just tried to reproduce this issue in ParaView 5.4.1 with the following:
- Load ParaView
- Add a Wavelet source from the Sources menu
- Add a Gradient filter from the Filters -> Alphabetical menu
- Color by “RTDataGradient”. Choose the X component.
The color scale endpoints are set to -15.35 to 17.42 and the color legend shows that.
Looking at this, I see that sometimes the data values and colors table can be out of sync with the range of the color map. You can toggle the advanced settings to hide and then show the color map values table again to update the values.
Another way to check the currently set color map range, click on the tool bar button . It will show the currently set color map range.