I just noticed on my Vog cub cap and coat that there is only a health bonus of +1, in the wiki it says I should have +4 bonus at level 1 and +5 bonus at level 5 (my armour+helm is now lvl 5). This has also happened with my friends armour and helmet too (vitasuit as I recall).
I upgraded my cap and coat from wolver cap and coat.
Depending on your depth within the Clockworks the Health bonus will change. At Depth 1 you will get +1 and as you go deeper, descending into Tier 3, your armor's full bonus will be unlocked. Try checking your armor on different Tiers (or in Haven, it will show you the real cap).