To reproduce, view this page with a iPad or iPhone running iOS 11.3 or later: [login to view URL] and try to use the pencil to draw a line - you will see the screen move and it's almost impossible to use the app.
Searching the web for a solution, I found a similar issue but I'm still not sure how to patch MethodDraw to fix it. See [login to view URL]: Bug 184250 - Unable to call [login to view URL] in dynamically added event listener ([login to view URL])
I believe it has something to do with dynamic event handlers.
We need this bug fixed. Please do not bid if you do not have a iPad/iPhone with iOS 11.3+ that you can use to debug and test the issue. I also have a video I can send you explaining the issue.
View a video demonstrating the issue here: http://workflowprodigy.com/IMG_0720.MOV