Statistics and Execution plan in SQL Server
Statistics are being updated when the following number of rows have been affected in the said table : 20% * (table row count) + 500, unless the table contains less than 6 rows (in this case it is updated every time 6 rows have been affected), or less than 500 (same rule applies).

Now for the plan you displayed, it looks very weird. I can't repro it either.
Can you tell us how yo updated the statistics please ?

@++ ;)