Incorrect information on Mythic Keystone Profile API

I’ve been exploring the Mythic Keystone API and have run into a somewhat mysterious issue.

When I point my client at /profile/wow/character/dalaran/svergun/mythic-keystone-profile/season/6, I’m supposed to get my character’s best runs at each dungeon during Fortified and Tyrannical weeks.

But when I look at Spires of Ascension, the Tyrannical rating is listed as 0, which is factually wrong. Looking at the ratings in Raider-IO, my best run at that affix is properly listed as a +15, not timed, 126.4 run.

When I look at it with the in-game interface, that same run is listed for SoA.

Why is the API not showing it?