Multiple Winner Items Health Check
What is the issue?
You have items eligible for online bidding that are configured to allow bidding but which do not have a quantity set.
Why is this a problem?
Without a quantity set there is no way to know how to handle online bidding on an item, since we don't know how many winners should be allowed.
What do I need to do?
Set the quantity field on these items to specify the number you have available.
If you intended this to be a fixed price item with an unlimited quantity then you should set the starting bid to equal the buy-it-now price instead and can leave the quantity blank for 'unlimited' in this case.