Whiteboard resizes when I double click

I have used the zoom whiteboard on my iPad extensively for the last year or so since it was released, however something weird has started happening across the last week.

if I draw using my Apple Pencil then it sometimes interprets my writing/drawing as a double tap, and it the automatically resizes the whiteboard eg from 100% to 125%. 

I cannot find any way of disabling this double tap irritation.

it also does the same if I access the zoom whiteboard via the zoom website rather than through the zoom app.

if I use the old zoom whiteboard the problem does not happen BUT it is not as smooth an experience.  I really like the zoom whiteboard, but the double tapping resizing issue make whiteboard use in online lessons unusable.

please help!!