Thanks Jonny. Not many spot that so first class observation!
When I started writing poetry I had to refresh my understanding of form and no sooner than I looked up the 'definitions' I found poets (including many very famous ones) were changing and adapting the 'rules'.
In trying to understand this I realised that terms such as "Sonnet" have to be a little flexible (Otherwise we wouldn't have so many variations!) What is trick of course is working out where the boundary is between still remaining a sonnet and becoming something else!
In this poem I did set out to write a formal sonnet but with a modern day issue embedded in the story line. To this end I felt the slight drift seemed to work and hence didn't try to change it.
I have just recovered from a nasty cold which left me being anything but poetic!!! However I will have a think about your challenge when my muse takes off her face mask and stops spraying me with antiseptic!