What was the puzzling event that occurred when two men from Goa offered Dakshina to Sai, and what was the immediate reaction?

A puzzling event described in Chapter 36 occurred when two gentlemen from Goa visited Sai Baba. When the matter of Dakshina arose, Sai Baba asked for a specific amount of fifteen rupees from one of the men, which he accepted. In a surprising turn, when the second man voluntarily tried to offer a larger sum of thirty-five rupees, Sai Baba outright rejected it. This action was perceived as partiality and, as the text notes, 'Everyone was greatly surprised by this.' The immediate reaction was one of confusion, which prompted Madhavrao, also known as Shama, who was present at the time, to question Sai Baba about the seemingly unequal treatment.