I'm not sure if you mean this, but its possibly the "edge" from M to the border ...
Ok, let me explain the fonts ...
Each letter has a fixed size "box" where it is located. Therefore, if the font creator does not use the full room, this effect can happen! So you canβt do anything against this except editing the font!
Here is an example (a step-by-step guide on creating fonts) that I have in mind.
Example Figure where you see the distance from the top M ... so if you do not make the left M dash curved, do it directly, as in your version, you will have a βspaceβ between your border and M! :)

You can see that the character is correct as it is if you select your text. The "blue" choice will show you that it goes directly with the border and has no space, whatever would happen if there was a rendering error or css!
Hope I could help you answer this question.
creativeby
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