Mage character's Mythic Best ilvl reward shows half the expected value -
eg:
(130) 15 - Mists of Tirna Scithe
(130) 15 - Spires of Ascension
(125) 14 - De Other Side
(125) 14 - Halls of Atonement

Other classes have correct values expected based on highest completed key level.

Does it get fixed if you log back onto your Mage?

This is probably an intermittent Blizzard bug with their C_MythicPlus.GetRewardLevelFromKeystoneLevel API.

No unfortunately, the value displayed is still wrong when I log into the mage. Replicated again this week, with different instances completed, see attached.

Hey, if you encounter this bug on your mage again, try running /dump C_MythicPlus.GetRewardLevelFromKeystoneLevel(15) on it and reply what you get. Thanks.

That's the response on the mage.

So this is Blizzard's issue.

@LiangYuxuan if you can nail it down exactly, please file on https://github.com/Stanzilla/WoWUIBugs

@CelendilAU Would you please try /dump C_MythicPlus.GetCurrentSeason() and reply what you get? I think this iLvl matches BfA S4's.