Standards showing up in chem tables even though not checked for site

Standards can be saved to your Layout.  Any that you have turned on when you save it will be enabled next time you select that Layout.

The easiest way to check if it's a Site standard or a Layout standard is if there is an "S" shown next to it in the Env Standards menu on the Chem Table. The S show's it's a Site standard, and any others selected are likely saved to the Layout.

IF you don't want these standards save to the layout to show by default, you can deselect them from the Env Standards dropdown and SAVE the custom layout so that moving forwards they don't appear in tables unless selected manually.