Hello Alex,
I wasn't able to reproduce the mentioned issue. A short video test is available here -
http://screencast.com/t/DL4Ryci6p for your reference. I have modified the
ComboBox / Server filtering demo like that:
If you are not using the latest Kendo UI version - 2016.1.412, does upgrading to it help? Otherwise it would be better to reproduce the issue with the code above and then tell us what changes you have made, so that we can proceed further with the investigation.
Regards,
Danail Vasilev
Telerik
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