I'd tend to lean toward CO2 in the wine. When you added pot met to stabilize, it likely started to replace the free SO and thus released gas. Could have been too slight to see as you're racking into bottles, which also disturbs the wine causing more gas to release. That coupled with the short time of just 3hrs from bottling to noticable pressure in the jar...
Primary: Sparkling White Grape Peach Wine
Secondary: Coco-Strawberry Wine, Pumpkin Wine, Apple Cider
Bottled/Aging: Pear Wine, Strawberry Wine, Blueberry/Blackberry Wine, Mixed Berry Wine (Blueberry, Blackberry, Strawberry, Raspberry, & Cherry), Jalapeno Liquor, Skeeder Pee