I've always heard I plant that Hermes will produce Hermie seeds, is that true for plants a Hermie pollinated?
It depends on what you are talking about.
Basically there are two kinds of hermaphrodites.
A real hermaphrodite will be a dioecious hermaphrodite. that means it has both an X and a Y chromosome (XY).
These will tend to exhibit both male and female flowers.
These are pretty uncommon, especially if dealing with a stable variety.
The most common hermaphrodite seen when dealing with cannabis is a monoecious hermaphrodite, which is not a real hermaphrodite.
A monoecious hermaphrodite is usually a female plant that for some reason, usually stress, produces male flowers.
the seeds that result from a monoecious hermaphrodite will be feminized. The plants will be about as likely to produce male flowers as the parents. If you stress a plant and make seeds, the resulting plants will probably react in the same way to the same stress.
This is normal and natural and reason number 4,087 why cannabis is the best plant in the world.
Like if you have 1 female that Hermied and one female that got pollinated by the other one, will the seeds from the one that didnt Hermie produce Hermie seeds?
Absolutely not. Since there is no Y chromosome in that equation, the resulting plants can not be real, dioecious hermaphrodites. They will be just as likely to produce male flowers under similar conditions.
like does Hermie pollen just make Hermie seeds or is that only the case with the plant that Hermied itself?
There is no such thing as "hermie pollen"
You are fine. Your environment is the culprit, not the plants.
Yes they will produce hermies and be unstable and unreliable.
That is absolutely not true. They will not produce "hermies" and as long as the parents were stable they will be stable.
Really bad advice.