But the first transaction dissapear when i use zapwallettxes. The 1º transaction dissapear and the amount of btc back to my wallet. And then i do an other transaction. And this second transaction dont apear for the moment in any explorer
And the first transaction is still in block explorers even though it's not in your wallet?
I have a feeling that is the one which will be confirmed, so you should close Core and launch it again with -rescan to display he old transaction again. The coins all being there in your node may be a false indicator caused by a stale blockchain state.