Sorry about the late response, I have probably missed your ticket by accident.
Is the drop down completely missing or is there the box but the icon is missing? It's most likely a stylesheet issue or a 3rd party plugin/theme style is overriding it, but it's impossible to tell unless I see it. Can you provide an URL and access details where I can check this problem?
Let me check if there is any way possible to allow decimals in the range slider somehow. The script might not support it, I'm not sure.Best,
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