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Since miners (PoW & PoS) constantly generate new blocks, some newly generated blocks can be transmitted to the network almost simultaneously. The transmission of information between the individual nodes (peers) takes some time. For this reason, there is a possibility that one group of nodes decides to validate one block while another group validates the other. Eventually, this would result in one of the blocks being orphaned. The formation of orphan blocks is completely natural and in most cases occurs by chance. However, they can also arise when malicious actors attempt to create an alternate valid blockchain.
Daily recognized Orphan blocks can be viewed at chainz.cryptoid.info (since March 12, 2020).