Favoured Soul Greater Invisibility Duration is Broken

[TheSandiestcomet]

Description
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Favoured Soul's Improved Invisibility doesn't work as intended. The duration is far lower than it should be - On my 15th level Favoured Soul, casting extended imp invis concealment should last for around 30 minutes. This lasts barely three.

Steps to reproduce
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15th level Favoured Soul, cast Improved Invisibility, get into combat to wipe the invisibility, wait until it disappears. PC is a Drow.

Expected result
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Imp invis should give concealment for 30 minutes.

Actual result
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Concealment fades after around 3 minutes.

Screenshot(s)
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N/A

Misc Notes
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N/A

Which Server(s)?
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All

Gaming Platform(s)?
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PC

[Paint]

Earlier today, I used Improved invisibility on my Favored Soul and didn't have the same problem, so I'm not sure it's universally affecting all FSes. Are there any other details about your character's situation you can provide?

[Kenji]

Were you in combat and did the mobs spam something along the lines of Invisibility Purge or Dispel Magic?

[TheSandiestcomet]

Was definitely in combat but it was vs grimlocks (not seers). Definitely wasn't being dispelled, not sure if they (reavers and ragers) have invis purge.

I'll see if I can get a video when I get home.

Edit: also just to note, the only thing special that I could think of is that they're a release-day FS and a Drow, attuned to the same god that they worship, have evo and conj focus, extended imp invis at level 15.

[Good Character]

I believe the grimlock shaman has invisibility purge.

[TheSandiestcomet]

Maybe I just missed it in the combat log, things were hectic.

Seems to be fine now that I'm level 17 anyway, so I can't really document it. Chalk this one up to my own user error I guess ^^;