Version GreenHopper 6.1.1
How to reproduce:
create 3 issues A, B, C
go to planing board with filter that matches the 3 issues
create sprint
rank the issues A highest and C lowest
add a quick filter that just shows C or type C in the filter input field
pull down the sprint footer to add C to the sprint
disable quick filter
expected: Only C is added to the sprint
actual: A, B, C were added