One of the problems with those machines that despite the on screen monitor telling you it's London Overground, it's still the Southern typeface and functions with a different colour with their machines still being used.

I'm sure the LOROL machines at the ex Silverlink stations are different to our ones. Hopefully once FH has been fully integrated into London Overground in May, this won't be an issue with the ticket office having the same facilities and equipment as the Tube. (although still selling National Rail tickets)