What puzzling event occurred concerning Dakshina when two visitors from Goa met Sai Baba, and what was the immediate reaction?

The account in Chapter 36 details a puzzling event involving two gentlemen from Goa. When they came for darshan, Sai Baba asked one of them for fifteen rupees as Dakshina, which the man gave with joy. In contrast, when the second man offered thirty-five rupees on his own, Sai Baba flatly rejected it. This difference in treatment was unexpected and caused confusion. As the chapter notes, "Everyone was greatly surprised by this." The perceived partiality was so striking that Madhavrao, also known as Shama, who was there at the time, was prompted to ask Sai for an explanation.