It appears that they neglected to report extensive “in-kind” donations on the Prop 8 campaign:

….. The Church of Jesus Christ of Latter-day Saints failed to report money invested to organize phone banks, send out direct mailers, provide transportation to California, mobilize a speakers bureau, send out satellite simulcasts and develop Web sites as well as numerous commercials and video broadcasts.

It’s not the contributions, it’s the failure to report that is in question here.