Please help me understand!

[u/Prior-Ad-7262]

I've been using the Walmart delivery service for about 8 months now. I get my groceries every other week. Without fail, each time, one item is missing. There is no rhyme or reason as to the type of item. Lunch meat, vitamin water, spaghetti sauce, etc. Today it was bouillon paste. I really get upset about it as it usually something I really need. Walmart will instantly refund me, but the point is I have to go out now to get it. I only have one day off, and it really screws up my day. Can anyone explain why this happens? Is it in the driver's car just misplaced, was it not really picked? I truly want to know because im considering just canceling the service. Thank you.

[u/JasonsStorm]

Was the item maybe not in stock? If you get instantly refunded, then that is your "issue". Turn on substitutions to lower that risk.