Garage door opener repair question


So I have a craftsman 1/2 hp garage door opener. The gear and sprocket that moves the chain broke. So I bought the part and swapped it out. Now the garage door moves but it only opens about 65% and when I close it the door will close then open back up on its own. I have tried to adjust the travel up and down but it makes no difference. I had to unplug it. Did I wipe the memory? What did I do wrong?Edit I was able to get it adjusted properly after a few things. Thank you via /r/DIY

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