Hi Rose, I have the same issue and in javascript console I have the following error:
Uncaught TypeError: Cannot read property 'lastX' of undefined
at jQuery.fn.swinxyzoom.modes.slippy.i.zoom (plugins.min.js?ver=5.4.2:1)
at n.zoom (plugins.min.js?ver=5.4.2:1)
at HTMLDivElement.s._mousewheel (plugins.min.js?ver=5.4.2:1)
at HTMLDivElement.dispatch (jquery.js?ver=1.12.4-wp:3)
at HTMLDivElement.i (plugins.min.js?ver=5.4.2:1)
Is this a misconfiguration or a code problem?
Thanks
Regards