Environment

Windows, Chrome, IEб vue@2.5.13, iview@2.9.0

Reproduction link

https://jsfiddle.net/ewezz7jo/18/

Steps to reproduce

From scratch.
Simple create grid with more than 24 items and get problem

What is expected?

Expected standard work of ordering. All items should stay according by order prop.
Our task is create big grid and add dynamic additional elements in any places

What is actually happening?

Items shows from order 25, and the end items with order

Checked standard flex grid and bootstrap grid, it works wll