Changing the background color for the second/subsequent paragraph causes background color for first/previous paragraph to be lost/changed.  This is a browser-specific bug.

Reproduction steps:

    Navigate Internet Explorer/Edge browser to: Telerik RadEditor Demo Page
    Select-all and delete.
    With cursor at the beginning, select a background color from the toolbar.
    Type some text.
    Hit the Enter key to start a second paragraph
    Select the "no-fill" background color from the toolbar.

Results:

-The background color for the first/previous paragraph is removed.