...I seek the transaction id in blockchain and says: "Sorry We Could not find any blocks or transactions matching this hash", but I seek the same id in tradeblock and says that the transaction has not been confirmed. I check in my wallet in blockchain and shows no pending transaction, but in tradeblock shows that the value I sent is pending. Can someone explain to me what happened? It is normal that happen?
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Anyway, TLDR; what you need to do when looking for "send" transactions from a Xapo wallet is to search the blockchain for the receiving address that you sent the bitcoins to. This should show the pending inbound transaction.
If you read what the OP wrote, you would know your answer does not help him.
The OP asked why the tx id can be found in one blockexplorer but not in a different blockexplorer.
When a transaction don't get confirmation it will be removed from the blockchain after some time. Or maybe not enough propagation, so most nodes didn't even see it.
Or it is just a problem with blockchain.info
This is incorrect. No transactions are ever removed from the blockchain, that is impossible (in this situation).
Transactions are only dropped from nodes when they do not meet the requirements for that specific node.
If you have no confirmations, then you are just in the mempool pending for a confirmation.
When a tx is confirmed, it is "engraved" into the blockchain.
A Hero Member such as yourself should know better. Tisk Tisk.