Leaflet rejection for quality reasons - need some advice

Hey there

I got a rejection for this leaflet for quality reasons.
Can you guys give me some advice on what went wrong here with the quality standard?

I wonder is it the quality of design or is it a technical quality reason?
This time, I made sure that I have everything layered, named…
Btw, is it expected to have everything set up in InDesign as well as in Word, in A4 and in US letter format or so?

I hope s.o. can give me a hint on how to improve this:

Thank you!

No one any feedback?