what the heck is making me fat?

Lately i seem to be putting on more belly fat despite going to the gym 3-4 times a week and walking at least 40 minutes a day with my pups? I was away for two weeks and all my clothes felt loose I've now been back for almost two weeks from traveling and i feel swelled and fat. while we were away we didn't eat very much due to being on the go all the time. since i got back I've been eating my normal 1800 cals but I'm getting fat! the only difference in my eating is for the past two weeks I've had White rice twice a week. I've added two tbsp of peanut butter a day to my daily intake and sometimes it's chocolate peanut butter besides these two additions my foods been the same so why am I getting fat? Ps it's not my time of the month and its not in my head its quite clearly on my tummy! Please help or advice!

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