Wrong glyph for greek 'ano teleia' U+0387

The Greek punctuation mark of 'ano teleia' (U+0387) is equivalent to the English semi colon.
Windows fonts (such as Arial, Times New Roman, and Georgia) display the glyph correctly, that is the dot appears at the same height as the dot of the (english) semi colon, and the higher dot of the colon. However, ubuntu fonts such as Liberation Serif and Nimbus Roman, have a glyph where the dot is wrongfully positioned significantly lower. It appears to me that U+0387 is the exact glyph as 'middle dot' (U+00B7)
Depending on the system you use, here is the problem graphically ;:· (ano teleia in the end) against ;:· (middle dot at the end).

If you read this post in a system with windows fonts the two characters above are visually different. With Ubuntu fonts, they appear to be the same.