Your post is so vague and does not have enough details for discussions but generally when you are broadcasting a transactions, three main things you must pay attention on and be very carefully in typing, double checking, broadcasting and signing your transaction.

The receiving address: make sure it is accurate by checking it several times.
The amount of bitcoin to be sent to that receiving address: make sure it is accurate too.
The transaction fee: make sure you check the fee rate, and the transaction fee and don't make any fault on over spending fee.

How to lose your Bitcoins with CTRL-C CTRL-V.