I am using the latest version
when using the feature (applied on the product page settings)
"Open Product Designer In..."
"page after user clicks on customization button"
The text and uploads that are added are placed centred to the top left corner of the canvas with the default settings ignored including font size, resize, dragging. The default as set in the settings menu would be centred and formatted. All other combinations of canvas work as intened on my installation
I tried replicating this on my server but could not. Can you open a support ticket and send login data so that we can take a closer look?