Walmart keeps canceling my grocery orders

I place a grocery order for pickup every week, using the same card, picking up from the same store, and on the same day. The charges are going through to my card, but about 10 minutes after I place the order, they cancel the order, sending a text and an email.

The email says:

We’re sorry, we had to cancel your pickup order because it was flagged by our policy review team.

I called after trying to place the same order again and having it canceled again, and he said he notated the account and that I should try after 30 minutes. It was late, so I asked if I could try in the morning and he said that would be even better.

I placed the order this morning, and it was canceled again. I called again, and they basically told me the same thing about "escalating" this time and told me to try in 2 hours. He said he was confident it would work this time, but I asked if he did anything different from the guy last night, and he said he did the same thing.

Not being confident this is going to work, I looked for alternative contact methods and found this post and called the number ending in 2743. I spoke with another rep and she said she would put in a "technical ticket" since the other thing didn't work, but that it might take up to 5 business days. She said I would get some kind of confirmation email that my account had been fixed.

Does any of this make sense, and should I be trying anything differently?

TLDR: The same order I always place keeps getting canceled due to being "flagged by our policy review team". Not sure what to do beyond calling.