rear brake help Options

[Malhar95]

so i was changing my rear rotors and pad, and came accross a little problem
my disc seems to be grinding from the bottom. the only way it stops is when i push it in from the bottom.
i know its not a man. defect b/c its doing the same with my old ones.

heres what i did:

1. took the wheel off.
2. took that one bolt for the caliper, 'slidded' (if thats a word lol) it up, and pushed it to take it off.
3. took the two bolts behind to take the bracket off.
4. and then just pulled the rotor/disc off.

its only doing it on the driver side.

and when i started driving it, its still grinding (a little) and squeeks when i drive, stops squeeking when i apply the brakes.

my question is:
is there something else which holds the rotor in place?