Unable to rearrange rows after copy paste

As the title implies , I am unable to re-arrange a bunch of rows after copying and pasting from one document to the another on an iPad.

Holding and dragging animates the row moving but soon as i let go its back to where it was initially.
Have tried cut/copy paste and the row still jumps back to where it was.
Select and Move also has no effect.

There is no special formatting on the rows, just plain text.
Could the rows possibly be locked and they need to be unlocked? Cannot see any option for this!
Any help much appreciated.