Get error every option I try to add: "d.toFixed is not a function"

Hi, I've downloaded all libraries and tested 2 of them and I get errors when I add custom options in the field configuration, for example:

using jQuery Timepicker Addon, I added to config
hourMin:7
but I get (in browser console)
jquery.min.js?v=3.4.1:2 The specified value "66:30" does not conform to the required format. The format is "HH:mm", "HH:mm:ss" or "HH:mm:ss.SSS" where HH is 00-23, mm is 00-59, ss is 00-59, and SSS is 000-999.
and the slider move only from 70:xx to 66:xx (yes, seems to move in reverse, from the higher to lower number with just 2 steps).

if I set
stepMinute:15
I get
Uncaught TypeError: d.toFixed is not a function

Am I missing something?