Bulky error when saving products after adding categories

Hello. We have 1 error, when we try to do bulk add categories, it just doesnt work. It doesn’t save the product categories. It saves like 70 out of 100 products. There is no errors showing on plugin, it just doesnt save all product when setting categories. And also for some products we need to do it like 3-4 times for each product to save its category.
Can u take a look? Thanks.