All three companies have been impacted by higher interest rates and lower customer spending.Market volatility is picking up again, with major sell-offs in many top stocks. Tesla (TSLA 0.58%) and Cognex (CGNX -0.03%) have plummeted in recent weeks, while Plug Power (PLUG -5.29%) continues its multiyear downtrend.Here's what's driving the sell-off in these growth stocks and whether they are worth buying on the dip. From growth to value, to growth againDaniel Foelber (Tesla): Tesla has been on a roller coaster ...