Crusaders of Light – Why I do not receive Reputation Exp after completing reputation tasks ?

After finishing two types of reputation tasks (except Scholar Q&A, Trial Quest) on one day, the other reputation tasks will not offer reputation Exp any more on that day. For example, upon completion of two reputation tasks such as Wine Expedition and Preparation Quest, the 3rd task like Learn about the strange events will not offer reputation Exp but Scholar Q&A, Trial Quest will still do.