[2.6.1.1][SKBW]
I've also been getting this. i was recently cured of food poisoning ten times in a single day. I've also had my chancellor improve relations with someone multiple times in one day (I suppose I should be thankful I have yet to see him screw up multiple times in one day). Finally, my marshal has at times improved recruitment multiple times in one day.
DLC: I have all DLC except for Songs of Yuletide, The Song of Roland, Tales of Treachery, Orchestral Horse Lords, Viking Metal, and Full Plate Metal.
Mods: I am not subscribed to any mods, though the game says I have "Bloody Peasants," "Decadent Caliphs," "East African Clothes," "Ruler Designer Unlocked," and "Treasonous Adventurers," all of which are inactive.
Reproduction Steps: It appears to happen all over, but assigning my chancellor to improving relations will almost inevitably trigger the bug, as will assigning my marshal to training troops.