You can reproduce the bug even in your documentation: Overview - DatePicker - Kendo UI for Angular (telerik.com)
The problem seems to be the infinite navigation that's overlaying with that dates' columns.
Hello
Currently the datePicker and probably other controls that implement the rangeValidation property do not listen to changes on the rangeValidation input.
This is preventing whether range validation is enabled based on other form input changes during user interaction with the form.
Can this be changed so it listens on ngChanges?