What will you do if your FD1 drone starts taking off sideways?

There are several reasons will lead to the issue like your description.

Please check as below.

（1）Whether all properllers are installed well?

（2）Whether the GPS cover is installed in the correct driection?

（3）Did you mount heavy object？If the mounted stuff is not uniform, it will also lead to this issue.

（4）Please try to adjust the remote joystick channels as the user manual.