Sounds normal to me...
Plants coming indoors where the heated air is dry... from the humid outdoors will experience some leaf drop...
Just be careful about watering... too dry is preferable to too wet.
This year, when I potted up a ghost pepper plant, the guy taking care of it was taking it out doors to water, and apparently just pouring water to the plant... I noticed dying sections of the plant, and had a little discussion about not drowning the plant...
Citrus trees (and whatever else) grow new leaves easily... recovering from over-watering? not so much.
Personally, I usually don't water until I see leaf drop... Taking the plant outdoors when they predict a warm stretch of at least a week, seems to give good results as well.