Hi,
如果你当美孚加载签名组件e device is in vertical position and then rotate the device in the horizontal position the component doesn't detect changes and the signature capture doesn't work as it should (there is a span between the mouse/pen and the signature line). The same also happens in browser if you change the browser window size so much that the signature component window shrink. I noticed a strange behaviour in signature popup on my project, but you may also try it on your demo component:https://demos.telerik.com/kendo-ui/signature/index.
Thanks