I kinda noticed a bug on the bulk editor page of products.
If you select a cell in a column and use sidebar to scroll down and try to select multiple cells by holding shift then it won't select them. The cell will be activated on which you clicked while holding shift.
If I select a cell and scroll down using mouse and try to select multiple cells while holding shift then it works.
If helpful then please Like and Accept Solution. Want to modify or custom changes on store Hire me. - Feel free to contact me on firstname.lastname@example.org regarding any help Shopify Partner | Skype : bamaniya.sky PSD to Shopify | Shopify Design Changes | Shopify Custom Theme Development and Desing | Custom Modifications In to Shopify Theme | SEO & Digital Marketing