That's because your starting and ending strings have different amounts of numbers and are formatted differently, thus the complex string animation can't function the way you expected.    There are two pretty easy solutions:    1) Just make sure the start/end strings have matching formatting and quantity of numbers:  See the Pen OJGgXRQ?editors=0010 by GreenSock (@GreenSock) on CodePen   2) Use a CSS variable to simplify things: 
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