what are orphan blocks in proof of stake coins? and why they are created any particular reason?
I've read about this a little bit, and from what i can find, they're the exact same as with PoW coins.
It is explained a bit more/better here,
https://bitcoin.stackexchange.com/questions/8172/what-happens-if-two-miners-mine-the-next-block-at-the-same-timeYes, it is possible, and you can actually follow "orphaned blocks" here:
https://blockchain.info/orphaned-blocksBitcoin clients always trust the longest chain, so if two blocks is mined on the same time, it's up to (51% of) the miners to decide which is going to be 'accepted' and which is going to be worthless.
This is one of the reasons why you shouldn't trust only a few confirms, as the confirms could be a orphaned blockchain. After "enough" confirms, everyone will mine on the "correct" blockchain, because any work(mining) on a orphaned blockchain is waste of power (unless your trying to perform a 51% attack).
Note that they're using the POW (bitcoin) perspective here, although that doesn't really matter.
The definition as per blockchain.com,
Detached or Orphaned blocks are valid blocks which are not part of the main chain. They can occur naturally when two miners produce blocks at similar times or they can be caused by an attacker (with enough hashing power) attempting to reverse transactions.
