Device: Galaxy S8

OS: Android 9;

WTR (way to reproduce an issue):

Step 1: Go to Champions;

Step 2: Select Miscreated Monster, and Equip Artifact Set: Life;

Step 3: Enter Combat with Miscreated Monster and notice that no Bonus HP has been applied to his health bar and has infact had the bonuses subtracted instead of added while his companion's bonuses are still applied correctly.;

Description:

After recently rising my Miscreated Monster to 6*, I noticed that his Artifact Set: Life sets no longer apply the additional HP to his health when he is in combat and instead remove health.

In the following images, you'll see Miscreated Monster's Health with his supposed bonus, then Alure's Health with her bonuses. 

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According to Miscreated Monster's Stats, he should have 31,893 HP. (19,155+12,738)

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According to Alure's Stats, she should have 10,778 HP. (7,140+3,638)

The third image is taken during combat and clearly shows that Miscreated Monster's Health is less than Alure's, despite the evidence to the contrary. 

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Each 'Health' Pip is roughly 1000 HP, so we can infer that in combat Alure has her correct total of roughly 11,000 HP (disregarding the shield buff), while Miscreated Monster has roughly only 6,500 HP. 

If we take Miscreated Monster's Base HP of 19,155 and subtract his bonus of 12,738 instead of adding it, the end number is 6,417. Which is what appear to be shown in the combat image.