I have forked a repo and I commit and push new changes and merged changes came from pull upstream after doing squash. So isn't is supposed to show
The branch is x commits ahead of upstream:master"
Instead its showing
The branch is x commits ahead of upstream:master and y behind of upstream:master
Isn't it strange?
because I have merged upstream code and committed it along with my new code.
Being ahead and behind means a divergent history.
But if you did a merge --squash (result from a pull, which is a fetch + merge), it only added a new commit, it did not rewrite the history.
See "In git, what is the difference between merge --squash and rebase?".
If you did squashing of your local history (previously pushed), then the history is rewritten, and you would get an "ahead/behind" message