Negative predefined value in slider

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Dear, Support team!

When I try to set a negative predefined value for my slider I get the slider position at positive value in the form.

In the example page the left slider (red) has a predefined value “-2”, and right slider has “2”. But both display “2”.

Is it my fault or software case?
Thank you.

The page I need help with: [log in to see the link]

 

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