I was turning in a couple of Paraversal Hauls, and after turning in the first one, the items rearranged slightly. I didn't notice it right away, and nearly discarded a stack of 697 Enhancement Cores. This surprise rearrangement has happened to me several times in the past.
It would be great if items would not rearrange until leaving the Inventory screen.
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I don't know why it does that either just like I don't know why when we sort our inventory it doesn't stay that way.