Path of Fire: Act 3 Mastery (not completing)

[Zietlogik.6208]

After finishing the final achievement in the Path of Fire: Act 3 Mastery collection (19 total) it still displays 18/19, even though every achievement is checked off.

[Inculpatus cedo.9234]

A screenshot might be helpful.
Here is a page with a widget that might help, as well: https://wiki.guildwars2.com/wiki/Path_of_Fire:_Act_3

Good luck.

[Zietlogik.6208]

Edit (again): Turns out, completing the "Who Needs a Magic Sword" achievement (hidden, and not listed as a requisite) will complete this. Still seems like a bug

this is a screenshot of what I mean

There is 1 achieve at the bottom of the list (Social Butterfly) that is, yes, also checked off (just can't increase the size of the achievement window to show all at once). I will try the API thing to see it is shows some anomaly, I wasn't aware that was a feature on the wiki.

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Edit: So according to the wiki, once the API is applied, there are 20 achievements total, one of which is still hidden to my account: "Who Needs a Magic Sword" is the only achievement of the 20 I have not done (even though the Achievement only asks for 19, and the one I am missing is not listed at all as a requirement)