Possible bug with gem interactions

So im playing a demonform build trying to maximize life regen.

I bought two megalomaniac gems with different allocations because im a megalomaniac and didnt read limited to 1

So one gem has Full recovery and siphon. Only full recovery gives hp reg (15%)

The other one has Heart tissue and Spirit bonds with each giving 7% hp reg for what i think would be 14%

To complicate things i bought a time lost gem that gives 7% life regen for each notable it hits. It happens to hit both Heart tissue and Spirit bonds

Here is where things get fucky for me: I think since Heart tissue and Spirit bonds give 7% life regen and are hit by the +7% life regen from the time lost gem it should add up to 7*4=28%

However when i look at my character sheet im actually losing 1% regen with the Full recovery combo being a tiny bit better giving me like 1hp reg more.

What the heck am i doing wrong?!

Images of the setups:
https://imgur.com/a/wUp1KeR