We are aware of this problem and have plans to address it very soon™ with an update to the wizard so that it is single-page-only, instead of multi-page.
I think it’s related to multiple tabs open on the wizard at the same time. I’ll forward this, but I’m hoping that with the wizard simplifications that will be rolling in, it should be easier for folks to finish an entry in its entirety before starting a new one in a separate tab.
Going to assume this is resolved now that the wizard is simplified to be fewer pages. Let me know if this is still an on-going issue for you otherwise!