The meaning of upside down in dream | Dream Interpretation
Figurative position indicating a reverse from positive to negative
The potential for chaos and difficulty is being emphasized.
To dream that you or your surroundings are upside down suggests that there is some situation or problem in your waking life that you need to straighten out. It may also mean that your initial assumptions about a situation were completely opposite from what’s really going on.
One is wrong about something, particularly in making assumptions.