Custom armor spawned with commands can't stack their armor points with other armor pieces. The screenshot shows an armor piece on me that's supposed to give more armor points than what is shown in the armor bar.
Edit: A helper helped; I was using the commands wrong. Thanks j_p_smith!
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Duplicate of MC-16466.
Make sure the attribute modifier on each armour piece has a distinct UUID (see MC-16466). If that doesn't fix the issue, could you provide the commands you're using to generate the armour?