Stupid ending ruined it all

Rating: 8/10 (24 April 2019)

The premise of the quantum realm and time travel in MCU is, when you change the past, you're not changing the future. You made alternate realities. Like how nebula is killing her past self yet she didn't die with her. And how Thanos came to the future and lost means there's a reality where he never got any Infinity stones, coz if it's the same reality, Guardians of Galaxy wouldn't even be assemble.
Now, how could Rogers change his past yet he could still be in the "normal" reality?