AES decryption is returning a very strange set of characters

Hello dear friends,

Have question for those who know little bit more than me about the encryption system: AES.

I am trying to decrypt a AES-encrypted string from a mysql database.
The way I usually do it:

1. go to phpmyadmin
2. find the encrypted string
3. paste it on http://aes.online-domain-tools.com/ along with the private decryption key.

Usually, it works well - so I'm almost sure there is nothing wrong with the website.

However, there is one column in the mysql database that doens't seem to want to decrypt.
Here is an example:


Encrypted string: '25f9e794323b453885f5181f1b624d0b'
Decryption key: '1697f925ec7b'
Output: ©»[à.ÊO6.{úèÓɅ
What is SHOULD output to: '123456789' (I know that because I registered this string in the database)


Here is an example of decryption from another column:

Encrypted string: 'e5452838a52fc8ff352602ad14d634e93ed71c03129166901181d9a44e5a2049'
Decryption key: '1697f925ec7b'
Output: 'user_bitcoin_address6' (correct)


WHY is it doing this to me?

Is there perhaps another way to decrypt it (such as create a php script and put it on the hosting server)

Please help, I have been stuck on this problem for over a week now.