The e-commerce giant's stock price won't necessarily track its business fundamentals in the short term.Shopify's (SHOP 0.34%) stock performance has been a mixed bag since the company went public in 2015. Those who bought in at the start and have held on since then are sitting on a 2,220% gain. But the stock has also taken some steep drops along the way. Over the past 30 days, for instance, shares have lost one-fifth of their value.What lies ahead for Shopify, operator of one of the world's largest e-commerc ...