My 2005 Mitsubishi Outlander is spitting coolant out the overflow tank at the top and causing my car to overheat

My 2005 Mitsubishi Outlander is spitting out coolant at the top of my overflow tank don’t know why. replaced the water pump because it had a slight leak checked the thermostat it worked just fine. Did not over fill the coolant and purged it until all the bubbles come out but I have no idea why it’s leaking. Anything helps thanks.