Ebay Jacking Up Price Of Shipping After Item Sold

I've been selling some of my old games on ebay. When I list the shipping details, it asks for the weight and dimensions. I use the same dimensions for the envelop size and I have a scale to measure the weight. I then choose the cheapest shipping option, which has an average of about $2 to $2.50 for shipping fee. But once the item actually sells and I need to print out the label, it then shows the shipping fee being over $4. Not what was initially stated. Anyone else have this problem? And can anyone explain why this is the case?

It feels like Ebay is being intentionally misleading. If it showed the correct shipping fee from the start, then it would be fine, but jacking up the price after the item has sold while I'm now forced to ship the item feels scummy.