Can a Phal. grow two new leaves simultaneously?

[RosieC]

All three of my Phals are doing that just now, even my not so well one. None of the leaves have stalled they're all just growing.

The two well ones have grown three or four leaves each since April and there has been two growing at a time for most of that period.

The one which is struggling just now put out a new one in April and a second started in mid July, but they are both still growing, even if a bit slowly.