# Data decrypted, but unwanted characters in the beginning

I am a bit new at cryptography, I tried to recover data from an old app database, I got the key and the type of encryption, it says "AES/CBC/PKCS5Padding", I used this online tool http://8gwifi.org/CipherFunctions.jsp to decrypt some strings, it decrypted but I got some characters at the beginning of my data, for example:

2cjABhgd?????samsung

?9??kj?D g?GALAXY S5
`

In that case I should only get "samsung" and "GALAXY S5", but for some reason I get characters at the beginning. I want to know why this happens and how can I automatically get rid off those characters of the beginning, because I have hundreds of lines of data that decrypts like this.