What A Sighting

[sjay2k]

On another 3/6 table in the same session...

I raise to $21 with KQ from the CO and only the button calls.

Flop Kh-7d-7s (pot $51)

I check, button bets $36, I call.

Turn Jd (pot $123)

I check, button bets $80, I call.

River Qc (pot $183)

I check (intending to c-r all-in for value), button checks behind with A7. WTF???