Need help - Elementor template changed my shop page layout, even I deleted all

Hi

My shop page is 3 column and normally show products per page



Today, I tried create a elementor shop template for testing, after I created, I published and preview, I haven't apply or change anything.



Then, I found my original shop page layout has been changed to 2 products per-page.



I deleted all new created elementor templates, but my shop page cannot recover to normal



1. How I can restore my shop page to normal ?

2. How to prevent such incidents not happen again ?



Thank you very much