Col_offset calculation in ast

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1 
import ast

m = ast.parse(
"""
def test(
	ewr,
	ats):
		print("123")
""")
print(m.body[0].args.args[0].col_offset)

m = ast.parse(
"""
if (ewr
	and af):
		print("123")
""")
print(m.body[0].test.col_offset)

"""
if (ewr and af):
		print("123")
"""
print(m.body[0].test.col_offset)

In the first and second examples, the ewr argument and the and operator are on the same level, however, their col_offset is different. The col_offset of the operator also does not change in the 3rd example. Why is it calculating so?