Missing 5* shards when getting a dupe in feature arena

Feel free to tell me if I’m wrong :
1) In basic arena, to dupe a champion give only SIG +1. No iso, no shards. Because it is a basic.
2) In feature arena, the champion is a « real » double. Its pictures is not blue, it gives iso.
So why did I only get a 100 5* shards (and iso) for a dupe of my Antman, awaken at level 99 BEFORE to receive the feature 4* arena rewards ?
More precisely, I got a 4* Antman and 800 shards (I was ranked under 400), became 800 + 100 5* shards.
No 4* max skill crystal nor 275 5* shards.
Isn’t there any problem with rewards ?
1) In basic arena, to dupe a champion give only SIG +1. No iso, no shards. Because it is a basic.
2) In feature arena, the champion is a « real » double. Its pictures is not blue, it gives iso.
So why did I only get a 100 5* shards (and iso) for a dupe of my Antman, awaken at level 99 BEFORE to receive the feature 4* arena rewards ?
More precisely, I got a 4* Antman and 800 shards (I was ranked under 400), became 800 + 100 5* shards.
No 4* max skill crystal nor 275 5* shards.
Isn’t there any problem with rewards ?
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Could someone from Kabam explain it and describe the cases ? (What we get in case of ... )