As far as I know qball, it doesn't matter what the item is just what the previous bid was, here's the table to work it out.

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@qball28 wrote:
I've noticed when you bid on an item they increase ( default )by different amounts ( some increase $5, some $1, some 50 cents and some a few cents etc.) why are the default increases different for different items. Can you set default increases? I had 3 bids and only 50 cents more now.😳

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You have only two bidders on your item.

One has increased his maximum bid & therefore the current bid will remain at $10.50 until a third bidder joins the fray.