https://explorer.webchain.network/uncle/97799 this is uncle block (1.56 reward), due to the fact that webchain has very fast transaction speed, it happens sometimes that 2 pools solve same block almost at the same time. pool that was slighty slower gets part of the reward - 1.56, while faster one gets base reward 50 + reward for including uncle, so 51.56

so 51.56 is just base reward+reward for allowing uncle onboard
while 1.56 is uncle itself (block that missed the train)