The product gallery I have created shows first rows properly but then it show a row with two products the a single row of remaining products. Gallery was set to 4 columns.
I have logged into your website and moved the “POMOLOTTO Citrine Bracelet” to trash and the layout is fixed. Which clears that the issue is coming from the product.
Please try recreating the product and make sure that all the tags are closed. Then check back.