HiA sale order I placed in a vacant price slot between two other...

Hi
A sale order I placed in a vacant price slot between two other orders 2 weeks ago was quite evidently mine over some of that period

A few sold as a part order some days later
Now the price has bumped up again to that price and back down

Now funny thing is the balance of my open order is still sitting there unfilled

Does anyone know what may have hppened there

My order should be still first in line having been placed there originally

Does anyone have an explanation?
thanks
h