I'd like to report a bug with the Telerik combo box opening animation.

The problem can be reproduced on your page https://demos.telerik.com/blazor-ui/combobox/templates

Reproduction steps

1. Open page https://demos.telerik.com/blazor-ui/combobox/templates
2. Change the window to restored mode
3. Open the Product combo box and observe that the popup animation works as expected
4. Resize the window slightly vertically
5. Open the Product combo box
6. Observe that the combo box popup animation starts in the wrong place

This issue is 100% reproduceable every time and also can be reproduce if the popup is opened and the window is maximized.

Please see the attached video from about 15 to 25 seconds. Note that I reproduce the issue in the video a couple of times however due to the quality of it you can only see the incorrect animation between 15 to 25 seconds.

I hope the information helps.