I'm trying to set a value of a field from a subroutine which I'm calling from an event handler. I'm simply doing width = 5
However, the field value isn't changed. However I can do height = 5 and the field value is set as expected. The field value for width remains unchanged at 12186.
I've tried changing the field name to image_width to no avail.
The form has neither controls height nor width.
What am I doing wrong / why is this one field not changing. I've tried deleting the field and recreating, and I don't see anything on this field that limits the setting of data.