Selecting text that has been entered and setting the line spacing to "Double" bolds the selected text and does NOT double the line spacing.  Upon reopening the dialog box the line spacing dropdown indicates "Single."  Any change to the dropdown results in bolded text.  A work-around is to set the line spacing to "Fixed" and 2x the font size, this will still bold the text but that is easily adjusted.

Reproducible: Always

Steps to Reproduce:
1. enter some text
2. select text
3. click ellipsis button in Paragraph Docker
4. select Indent/Spacing tab
5. select Double from line spacing drop-down list
6. click OK or Apply
Actual Results:  
Text is changed to bold, line spacing is NOT changed.

Expected Results:  
Line spaceing should be set to double, text should NOT be changed to bold.

Setting a fixed line spacing value works correctly (except that it still bolds the text) so the underlying funtionality works. This appears to be a disconnect between the user interface and the intended function.