exercising everyday and eating healthy

I exercise every day usually 90 minutes in total sometimes a little less, and I eat healthy there might be some days where I go out to dinner or am at someone's house (usually eat pizza when I am) but its only about three times a month. I eat about 1200 - 1600cals a day.... Last month on the 18th I hit my 6th goal weight of 178 and its almost been a month and I am only 177 :( any suggestions?

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