Product columns

Hello,
We have installed the filter and it works very well, except for one problem.
On this website you can see that 3 product columns appear.
https://www.didaplay.com/mobiliario-escolar/sillas-escolares/
But when you apply any filter it becomes 2 product columns.
https://www.didaplay.com/mobiliario-escolar/sillas-escolares/?wpf_filter_color=abedul
We don’t know the reason, nor can we find how to make 3 columns appear after filtering.

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