Can a light switch be installed upside down?
Just so, how do you flip a light switch?
the way you presently described your switches, both up (on) and your light off is common. if you flip one switch up to turn the light off and then go to the other switch and flip up to turn the light back on, then both switches will look the way you want. the next time you use one it will be backwards again.
One may also ask, will a light switch work if I wire it incorrectly?
If either wire at the light fixture is still hot then the switch is wired incorrectly. If one of the wires is still hot at the light fixture with the switch in the off position, then you most likely have the light switch on the neutral wire. Separate the bare ends of the wires so you can safely turn the power back on.
If it's a single pole light switch, you should just be able to take it out, turn it 180 degrees, and rewire it. It doesn't matter which of your two hot wires are where, the switch will only has 1 on and 1 off position. Turning it upside down will make it work the way you want it to. It's more about the dimmer switch.