I'm a noob and I need help. I want to change the Upper Values of those classes but whenever I change the value, it does the following (see the second attachment). The values I need to insert is 0 up to 43.33. I know that the issue is with the numbers being out of range. Maybe there's a workaround or anything?
this recent post describes what works for them
How to change the upper value in symbology classes... - Esri Community
or check the help
Graduated colors—ArcGIS Pro | Documentation
If it is a bug, then you should report it to Tech Support so that they can assess the case with your version, data and setup
You can tinker with the labels, so if your first break you want to be 0 to 7.4 then just edit the label to say that even though nothing in your data goes below 7.4.