Challenge returning output from video--not what I set as the inputs

I'm really confused about the output I'm getting for this challenge. I ran the attached code but had the last line as:

return len(common)

When I did, the prompt said that the code returned 1 when it expected 2. I couldn't figure out what the problem was, so I replaced len(common) with 'return my_list'.

The weird thing is that it returns stuff from the exercise--not what I defined as my_list. As provided, I would expected the code to return apples, coconuts, grapes, strawberries because even if my code is wrong, if I define my_list as something, don't do anything to it, then ask the output to be my_list, it should return what I input. Instead, it appears to give what my_list was defined as during the previous video.

This is the error message I get: "Bummer, Expected 2, got {married': True, 'first_name': 'Kenneth', 'age': 33, 'last_name': 'Love', 'kids': True, 'retired': False}."

Can someone please explain why this is happening? Thanks!

my_dict = {'apples': 1, 'bananas': 2, 'coconuts': 3}
my_list = ['apples', 'coconuts', 'grapes', 'strawberries']
def members(my_dict, my_list):
  common = []
  for key in my_dict: 
    if key in my_dict:
      common.append(key)
    return my_dict

### Example
# my_dict = {'apples': 1, 'bananas': 2, 'coconuts': 3}
# my_list = ['apples', 'coconuts', 'grapes', 'strawberries']
# members(my_dict, my_list) => 2