Adding Grid to secure containers

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First of all - you have too much grids in code you gave, you can actually notice you have 2 really small boxes on the right, it has nothing to do with your issue but they may cause other problems later on.
Second of all - be sure your mod load after those 2.

It's all in the filters, try to copy same filter as you have in first grid to others you have, They are the same, checked, therefore the issue is those filters lacking "Common container" ID, 5795f317245977243854e041
Making me surprised how did you even put it on first slot, but ok.

You can insert exact IDs of modded items so it will defo work.
And you had modded IDs there too, hmm, i'm out of ideas.
Maybe related how did you inherit the item layout itself. I suggest to clone gamma case as an item and build a new item on its base, like for example how MICC does.