That's especially odd since that lock screen looks like you have Android 5.0. AFAIK, they removed the ability to customize lock screens (except for the notifications, themselves) with 5.0. Unless I'm wrong, I believe you'd actually have to have downloaded an app to change the lockscreen. Have you downloaded any apps recently? As srkmagnus asks, is that lock screen background (a picture of a phone with the news feed on it) an actual picture of yours? Is that Wells Fargo icon on it a branding thing or just a random part of the image?