Hi, the app has a different D6… which is confusing.
And a different strum pattern… which is very confusing.
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Still got the wrong fingerings for D6 on this app song!
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I have just started with the App and noticed that the D6/9 chord is different.
Do I read it wrongly, is it an alternative way or possibly an error? Sorry for the possibly dumb question, I
have started only recently to play guitar at the young age of 74, so be patient
Oops!
Just noticed that a specific topic already exhists on the subject. My apologies
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Hi Alberto @AlbertoB
Welcome here you young one 
It’s good that you found it yourself, we are very patient here and you are certainly not the only young elderly person here…
Feel free to ask questions and don’t feel held back/stupid about it…not asking random questions in lesson-specific topics with chitchat, we have other threads for that, and feel free to take a look here Old Dog Topic
Have fun is what is all about here …O and learning songs of course 
Greetings,Rogier
They are all versions of a D type of chord that fits the bill so use whichever one you feel good with.
Check the similarities of the chord grips and notes in these diagrams.
— 
In the lesson, Justin teaches four options for strumming, from basic to that used on the recording.
You are right.
He does not teach the one shown in the App itself.
The one in the App is Old Faithful and that makes a fifth option.
you can use it or one of the others - or make up your own if tthat works too.
tagging @MusopiaApps