Working out, gained 4lbs in a month, calorie deficit

been working out for the past month. did a body progress track and i gained 4lbs in a month. i do 30 mins of cardio a day (i need to train my heart rate) treadmill: incline 12, speed 3.0mph, time 30 mins.

i tackle different muscles each day but i tend to also jump around a little which i need to fix haha

i intake about 1300-1500 cals a day. was 113 now 117lbs.

I dont know where the extra weight is coming from. I thought it was water retention but i feel like after a month it should have gone away.

does anyone have any knowledge on why this is happenig/ tips to get rid of the water weight?

my goal is to maintain but gain