I went all the way down to 163 and I keep gaining weight I don't understand why I am if I eat right and I exercise

You may be slipping up in minor ways that add up in the long run. Weigh and measure everything. Track your food on an app like Baritastic. It will keep you aware of what you are actually eating.

You could also try resetting your set point by returning to all liquids, and build up again to solid foods over several weeks.

If you have achieved your goal and stayed there for a while, a bit of weight gain is quite normal.

100% agree with Sunny. I log everything I put in my mouth: food, calories, protein, carbs, fat, even vitamins/minerals. That helps me see whether I need to change something to get my body back to losing weight. I don't trust myself if I don't log everything. ?

Are you still tracking what you're eating? Are your exercises making you gain muscle, which is a good thing, but weighs more, so maybe you'll see your progress in other ways like inch loss?

It can be tough when you’re eating well and exercising but still gaining weight. Sometimes factors like stress or hormonal changes can affect your weight, so it might help to consult a healthcare professional.