Start situation, product have value £109, I have enabled snipe with value of £111.
Somebody has bid £117. I select that line at program and press "Refresh" button.

Result (seen at attached picture) is missing current item value + text "Minimum bid is -0.95"

Negative Bid.tiff

This is not Mac related issue. This is due to eBay latest changes.
I just made an update to reflect that. No need to update the app itself.
Thanks for reporting.

Next time you can just provide the item number in question only, no need for screenshots for those kind of issues.