Most likely you have the Playful theme installed, where you have set the Navigation to infinite scroll , through GENERAL > Design > Settings in the left menu of the back office. To use infinite scroll, you have to place a minimum of 24 products in each category. If a category contains less than 24 products, gaps will appear between products. This can be visible immediately, or when you hover your mouse cursor over a product. Only use infinite scroll if you have at least 24 products in all categories.
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