Slider - Negative Integer Not Showing on Form Field

Cannot get to show negative numbers from the slider - slider always slides back immediately to corresponding positive value. Works fine with spinner, only slider appears to have this behavior.
Not sure if this is a bug, or I am missing something. Any suggestions much appreciated. Thanks.

Running latest Scriptcase Version: 9.4.032. MySQL Database. macOS Catalina 10.15.6/Google Chrome Version 85.0.4183.102.

For the integer field in the form:
I have disabled Regional Settings.
The slider has the following settings:
Slider Increment 1
Maximum Size 2
Minimum Value -10
Maximum Value 10
Accept Negative/Positive