Why are my code changes being overwritten when merge?

Question

git

There is branch 1 on the remote repository from which I created mine 1-2 locally.
After working with branch 1-2 (locally), I switched to 1 (locally), made a pull from the remote.
Switched back to 1-2 (locally) and did a git merge 1
As a result, most of my work was overwritten by the old code from branch 1 (no one worked on that block).
Maybe you have come across this?

Answer 1

Most likely, the code was overwritten when the conflict was resolved by those who resolved it.

Answer 2

we had when one person had 2 repositories connected,
he always considered the second code important. as a result, we ruled the same variable for a month
+ anyone can merge without commit or force-merge