Shipping rates not calculating

MV standard 4.18.3

I’m completely baffled.

One of our vendors successfully processed a 7-item order last week without any issues. However, yesterday, they received a 33-item order, and the shipping rates failed to calculate on the receipt.

I’ve double-checked everything—their rates are correctly set up to handle up to 49 items. I even tested it by adding four items to my cart, and the rates worked perfectly.

I have no idea what’s going wrong here. Since my recent update, this is the second issue involving a high number of items where something seems to “disappear.”

Does anyone have any suggestions or insights into what might be causing this?

Please share screenshots of the rates. Possibly, the order reached maximum weight limit for this shipping service?