I will need additional information in order to pin-down the exact cause of the issue. Therefore, I would like to ask you to review the following Dojo example
, where you can find a working MultiSelect implementation, where the data is being fetched from a remote service. Please review the example and modify it, so that the described issue is reproduced and send it back to us for a review.
, where you can find a list of the most commonly observed errors and possible solutions, which might be applied to resolve them.
Alternatively, you can also open a separate support ticket, where you can provide a code sample, which we will be able to troubleshoot locally and advise you further with suggestions on how to resolve the issue.