When i put my ultimate chestplate it gives 8+ Armour from the chestplate and 8+ armour from the tiered mod but it doesn't increase its armour

putting my chestplate on
https://cdn.discordapp.com/attachments/823386664583430144/823414989846347776/unknown.png

Result of it
https://cdn.discordapp.com/attachments/823386664583430144/823415027666386974/unknown.png

putting this chesplate on my equipment slot it doesn't increase.
https://cdn.discordapp.com/attachments/823386664583430144/823415115952553984/unknown.png

seems to work on my end, is this what you are trying to achieve