we are problems when we type is the sku

We have Square POS 1st generation.   When we type in the SKU in the search bar at checkout, sometimes it will automatically be rung up. Some times not, and we have to then search through variations to find the item.  We did not have this issue when we used the app on the IPAD. 
What do we need to do so that all items with a sku will be rung automatically?

 

Thank you.

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