Gained 8+ lbs when working out every day and eating clean/in a deficit???

So I started going hard with lifting and weight training this past May. My weekly schedule is a hard push day (shoulders chest tris) a hard pull day (back bis) a hard legs/abs day, a full body workout day, and HIIT sprints on non-lifting days. I do my lifts in 3-4 sets with 8-12 reps. On lifting days I also would go for a run/jog later in the day before dinner. I started May 2018 at 5'4, 118 lbs. I play basketball at my college and have always been fit/athletic looking (except my freshman year when I gained fat from excessive drinking lol and not watching what I eat but I lost that the next summer). It is now August 2018 and I weighed myself this morning, and the scale said 127 lbs. I ran out of the bathroom in shock!!!!!! Anyways I have no idea how that could have happened because I eat around 1200-1500 calories a day (foods like: egg whites and spinach, oatmeal, gold standard whey, turkey on whole grain wraps, grilled chicken salads, berries, apple and one tspb pb, plain greek yogurt, and very healthy dinners my mom makes like chicken breast and bunless turkey burgers and quinoa and sweet potatoes and salads and stuff like that). I track on MyFitnessPal. So I eat very healthy with an occasional weekend cheat meal like a family party I'll have desserts and stuff but not often. How on earth have I gained more than 8lbs while eating 1200-1500 cals and my apple watch tells me my BMR is 1390 and i burn around 500 active calories a day from my weight training session and running session combined. so im burning around 1900 total calories a day. I didn't want to lose weight at 118 but I did want to get more toned and lean. I do look lean I think like my stomach is flatter (??) I'm not even sure and I think my arms have definition but I am still confused as to how i GAINED weight if I was not eating in a surplus for the last four months. I've heard the term "newbie gains" but I've been playing basketball my whole life and doing the weight workouts with my team during the seasons and off season for years (though they are not as intense, we do a lot more running) but the point is its not my first time lifting?? If anyone has an explanation or idea please let me know! Thank you!

by peanutbuttabish via Bodybuilding.com Forums - Female Bodybuilding