Rear Disc? Drum?
The Tone Ring on the right rear and bearing need to be re-checked. Incorrect torque (over or under) on the spindle nut could lead to issues there.
Normally you shouldn't have any brake fluid loss. A brake job can be done without lossing fluid.
Was the bearing changed after these problems began or after? Was the hub/bearing replaced as a unit or were new bearings pressed into the old hub?