The provided information does not give a definite clue what might be the problem, but I would suggest checking for the following:
- identical IDs of buttons and/or Kendo UI Windows and/or partial view elements, which may lead to duplicate IDs being rendered on the page in a particular scenario
- loading a partial view inside a Kendo UI Window that is configured to use an iframe, or the opposite - loading a full web page in the Kendo UI Window, instead of a partial view
- initializing the same Kendo UI Window instance multiple times over the same DOM element
In case the problem persists and you need further assistance with it, please send us a runnable demo for local testing. Thank you.
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