Hi,
That's probably because you removed only some variants of a characteristic value.
If you remove the "bermuda S" variant, S still has to be displayed in the dropdown for the other colors, and bermuda still has to be displayed for the other sizes of the product.
However, in that case, if you select a variant which doesn't exist, the system doesn't let you buy the product:
take.ms/HvYPp
If you want to make it easier to understand, you can change the "characteristic display method" option of the HikaShop configuration to either "table" or "list".