The mirror element created at the wrong place when using flexbox

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1. Apply either the bug or feature-request label

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2. Describe the bug or feature

The mirror element created at the wrong place when using flexbox.

3. If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem

Demo: https://codepen.io/muhammed649/pen/BarYLEE

Please click and hold elements five or six to see the issue.

4. Please tell us about your environment:

• Library version: [1.0.0-beta.X | v1 stable | etc...]
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• Tech stack: [all | TypeScript vX | ES6/7 | ES5 | React | etc...]
• Other information: [Detailed explanation | Stacktraces | Related issues | Suggestions how to fix | Links for us to have context | etc...]