This issue cannot be reproduced, and there are several public examples of Story Map Tour applications with more than 99 points. An example is provided in the following link: http://ugis.esri.com/IETour/.
解决办法
Refer to the workaround for the bug in the following github link: <a href="https://github.com/Esri/storymap-tour/issues/20" target="_blank">https://github.com/Esri/storymap-tour/issues/20</a>.