Strange behaviour with an app just appearing on my home screen!?

I just turned around and my phone was lit up.

I swiped to unlock and then another icon appeared on the launcher home screen...

I already had one shortcut to iobd2 there but another appeared as I unlocked. It's got a larger icon!?

If I long press and look at app info, its the same app info.
If I go to the app drawer and add the app again, it adds it as a small icon, like the original one.

Am I just being paranoid or does this seem a bit dodgy?

Attached Thumbnails