My first thought is that you are confused and all messed up in the head, I know this because it happens to me from time to time.
You need to look at the whole circuit, not just this little part.
You have three battery banks.
Do these three batteries have a common point ? ie are they connected together at their negative terminals?
If they are, and that common point is connected to the ground of this circuit shown in your post, then you do not have a problem.
The only way to be sure is to examine the whole circuit, not just the fragment which you have shown here.
JimB