Can't figure out what issues they were referring too. Looking for ideas as to what went wrong.
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You have what is called chromatic aberration - the purple fringing you can see on the edges of the leaves - hence the technical issues.
Also, your picture is out of focus - it's not very sharp.
I can't find one sharp spot on this picture and the chromatic aberration is quite huge. I do not want to discourage the OP, but pictures like that should not be submitted.