There are many reasons why this may have happened.
The most common explanation for this error is that different brokers often use different abbreviations for the same symbol. For example, the CAC 40 Index is sometimes referred to as the FRA40.
If the signal you're copying uses a different broker, this may be the reason why it appears like you have copied an erroneous position, please double check that this is not the case.
If you still feel like there is an error, please get in touch by emailing email@example.com.