Would you examine the browser DevTools and see if there are any errors listed when requesting the items? If there are they can point in the right direction.
Also I noticed that async method is used for reading the data. Please try using the ToDataSourceResultAsync
method and see how the behavior changes. You can see more about ToDataSourceResultAsync
in the Axax binding article below:
In case the issue persists please send us a runnable sample where the behavior is replicated so we can examine it locally.
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