"Please enter a valid value" on greyed-out weight box when attempting to update listing with bids.

[brian_j_damage]

Hi, guys. I have some listings I'm attemtping to update with further info and additional pictures. The ones without bids updated fine, but when I add photos and the text line "Photos now available" then click the "continue" button on any listing with a bid, it returns me to the page with the error:

Please provide the correct information in the highlighted fields.

• - Please enter a valid value.Please enter a valid value.
• - Please enter a valid value.Please enter a valid value.

The "highlighted field" in question is the "Package Details" section, specifically the "Weight" field. Said field has the value of 1 kg that I set it to when I originally created the listing, and is greyed-out and un-editable (because there's bids on the item), so I have no idea how to fix this.

Is this a known issue with a fix in the pipe, or a workaround? I've tried signing out and clearing my cookies, I've tried using a different browser - neither trick worked, so I'm getting a little worried here.