I saved my wholesale tiers but one row disappeared. What happened?

When you click Save tiers, rows are cleaned up before saving:

• A row with an empty or zero Unit price is dropped.
• A Min quantity below 1 or left blank is treated as 1. Decimals are cut to whole numbers.
• If two rows have the same Min quantity, only one is kept.

So the missing row most likely had no price or repeated another row's quantity. Add it again with a unit price above 0 and a different minimum quantity, then click Save tiers. Tiers are always shown sorted from the smallest quantity up.