Please check out a bug in the material design theme for grid pageing combobox in mobile device. You can check this bug at http://demos.telerik.com/kendo-ui/grid/remote-data-binding you have to adjust "mobile:true" option and then run by mobile simulator instead of web. When you change the page with combobox. Grid's height will be reduced by combobox height. This bug occured only in material design theme. (I didn't check all theme. I checked material, default, bootstrap, nova, fiori, office365)
Hi Lee, thank you for contacting us. I have notified our QA about the problem reported. Notice that we accept bug reports in our github repository[1], while the UserVoice portal is oriented towards feature requests. 1: https://github.com/telerik/kendo-ui-core