Can protein shakes hinder loss?

I was curious. I have been taking in about 50 grams of protein a day in protein shakes for the last two-three weeks. Ever since then I haven't lost a pound. Anyone know what could be going on. I had surgery July 1 and am down about 62# in four and a half months. I started at 5'2" and 265#. I lost monthly: -27, -10, -15, -10, and nothing this month. I'm about ready to give up the shakes.

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