It depends on exactly how much money you had after Matchday 7 (the end of the first conference round-robin) and Matchday 15 (the end of interconference play) last season, but you picked up some boycott from each of those two that added together.
It looks like you probably had $3M-$4M cash on hand for one tick and $4M-$5M for the other tick -- with that, you would have gone something like... 21% boycott after MD7 due to being $4M-$5M cash on hand, which decreased by 3% after each home game in interconference play (-12% to a total of 9%) but then added another 18% boycott after MD15 due to being $3M-$4M cash on hand to go to 27%. You then had 3 home games in the 2nd interconference round robin (-9% to a total of 18%) and have played 4 home games so far this season (-12% to a total of 6%). The boycott will clear after two more home games.