Some holds are placed on items for various security reasons.
For new sellers, ( no selling history) for returning sellers ( eBay need to see the genuine owner has returned and the account is not being hijacked), or if a different valued item is sold than previous listed items, this too can be a sign of a hijacked account, and payouts can be placed on hold.
eBay need to see the items delivered, so if you have tracking to show this, your payouts will be released sooner.
@adnan360