Had this happen last night during an HAAT raid. I was using zQGJ lead, GMY, HY, Ezra and GK. Yoda had defense down, offense up and foresight. Hit battle mediation and defense down spread to the team along with the buffs. I didn't have screen shots but will take some when I test this again.
I keep using GM Yoda in galactic march and haven't experienced anything like that so far. Maybe it is a display error? Have you clicked on the buffs/debuffs to read whether or not it is actually the debuff that spread?
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Thus was in phase 1 of the raid