Light fixture goes out just before flush to ceiling

BV022061 10:07AM | 04/05/20

I changed out an old light fixture. It had 3 blacks, 3 whites and 1 red. Hooked up the lines but the light switch would not work. Found out red wire is the switch so connected black to red. Switch and light working now. Problem is when I mount the fixture to the bracket the tighter I make screws just before it is flush with the ceiling the light goes out and circuit trips. There is foil on the backside of the light. Could that be shorting it out when it meets the bracket?

thanks, Robert Vega