A Sofer I know posted an image of a mezuzah he wrote to show off his proud handiwork. I noticed that the yuddin in the Heh's in the Shem Hashem are all written exactly the same as a regular Heh, ie as an upside down yud.
However I learned that all the hehs in Sheimos Hakedoshos should be written distinctly and differently, for the first Heh and the second, ie first heh with a tag _ and second Heh with a tag | to be meshane the Sheimos hakedoshos as an added fence for kavanah LeShem.
Is this a problem to be concerned with if I see a mezuzah like the one described above with all hehes written the same. I asked him about it and he did not respond. Maybe he wasn't taught it or doesnt know.