The first 2 transactions are marked as 'Unconfirmed Parent' and the third transaction is marked as 'Unconfirmed'. What's the difference, do they link with each other ?
When electrum says that a transaction has unconfirmed parent, it means that the fund which is being tried to send in that transaction has been received in a transaction which is still unconfirmed.
Assume that you have sent bitcoin from address A to address B and then the same coin from address B to address C.
As long as the transaction made from address A to address B is unconfirmed, the transaction made from address B to address C can't be confirmed.
The two transactions that have been marked as "unconfirmed parent" can't be confirmed before confirmation of their parent.
Can you share your transactions IDs?
With sharing your transactions, you may hurt your privacy. But it won't have anything with your security.
I made transaction 3 first, then 1 and 2 (not remember the order between 1 and 2)
Is transaction 3 (Unconfirmed) the parent for transaction 1 and 2 (Unconfirmed Parent)