Formatting buttons for text in Product Description do not work

-- HikaShop version -- : 2.6.4
-- Joomla version -- : 3.6.4
-- PHP version -- : 5.5.24
-- Browser(s) name and version -- : Firefox and Chrome
-- Error-message(debug-mod must be tuned on) -- : None
Just doesn't work

Hi There
Under "Products" when I try to edit the text under the "Description" section, none of the formatting buttons are working.
Which means I cannot change the font size, font colour, or underline or bold.
When I click on the font colour "A" icon it does not even give a drop down menu with the colour options. Similar for the font size - no drop down menu appears.
However the picture button for adding pictures still seems to be working fine and I can swap between preview and code and editor.
See attached

Hi,

It looks like the problem comes from your text editor. Try changing it in the "editor" setting of the HikaShop configuration.