hard gainers?

I track my caloires, weigh and measure almost all of my food and can't seem to add any serious weight, I will gain a pound and then lose it a week later. Any one else have this problem? I know I will figure it out and continue to eat more and more but I never thought it would be so hard to gain weight. Any advice besides eat more?(just lost a little over a pound at 3,000 cals a day the past 2 weeks)

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