One of was accounts was recently unbanned.
The minute before it was banned, I had just finish transferring some items from one of my others accounts.
Although the account was banned for 'minor macroing', Jagex still reduced my stacked items to 1.
For example, they reduced my RSGP to 1gp, reduced all my food, runes and pots to 1, etc.
They usually wouldn't/shouldn't touch any items if the reason for the ban was simply from botting, but because I had recently been transferring my items from multiple accounts multiple times, it could be a reason for their act of doing so.
But I'm not confirming that that is the reason, this is simply a heads up.
Fortunately they didn't reduce the item stack of my rares, haha.