That is not a game error, because the Mayor's House/Mansion/Residence gives superbucks randomly. That means it may not drop every time you collect from it.
There is no strict rule on how often or how seldom it is supposed to drop superbucks. 💵
Sometimes it may take a long time because a random drop is unpredictable and depends on chance.
Please also note that changing the building's color does not affect the superbucks drop.
You can try to collect profit from this building more often to increase the chances to receive the superbucks. You can ask your friends to speed up the Mayor's Residence too.