The product listing when using columns doesn't fit 100% of the column width. For example, if I have it set to two columns it only fits 49.5% of the column width - or halfway across.
I didn't really hardcode it, just took out style="width:49.5%" or whatever as that will change if you have three, four or five columns and so on. The responsiveness works fine without it.
I've attached images so you can see before and after the change:
Before
After
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