Why did Liu Bowen dig Zhuge Liang's grave?

It is said that Liu Bowen helped Zhu Yuanzhang conquer the world, but after his success, Liu Bowen was very unhappy because of folk rumors that Liu Bowen was the second strategist and Zhuge Liang was the first strategist.

I thought to myself: I, Liu, have made great achievements and created great achievements for future generations. Kong Ming, what can you do to beat me just because of a two-thirds Shu kingdom, but before he conquered, he was already dead?

Liu Bowen more think more gas, more hate. So he sent a bunch of people to Zhuge Liang's grave and began to dig it.