@Jbauer0905 It sounds like you may have an unauthorized user who was accessing your account, if unknown tracks are now showing on your My Thumbs Up playlist.
Unfortunately, there isn't a way to restore that playlist back to a previous version - you will need to manually remove any tracks from that playlist that you don't want.
In the meantime, I recommend we run through some steps to help secure your account.
To begin, I've gone ahead and removed all the devices associated with your Pandora account. This will automatically sign you out everywhere including any devices you currently have, so you will need to sign back in once this change takes effect. Please be patient as this may not happen instantaneously. You will now need to change your password to something new as well in order to fully secure your account. Click here to request a password reset and make sure to enter the email address associated with the Pandora account you'd like to access.
Next check the Inbox associated with that email address in order to continue through the password reset process.
If you don't see the message in your Inbox, please check your Spam or Junk folder.
Let me know if you continue to run into issues with this.
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