That's because your advanced aggregation is not aware of your AMID filtering in the chart dimension, thus considering 'TTTT' when ranking, but filtering it when matching advanced aggregation dimensions with outer chart dimensions.
You would need the dimension filter also in the inner aggregation (since aggr() function does not allow a calculated dimension):
=sum(aggr(if(rank(sum( {<AMID -= {"TTT*"}>} Sale))<=5,sum(Sale)),YEAR,AMID))
