Hello everyone. I upgraded a zen cart website from an older version to 1.5.6 and now Multiple attribute product display correctly but single attribute product doesnt. When I add a second attribute for that product it displays fine, but when i add the second attribute it doesnt.

Example below
This product has 1 attribute added Color and all i can see it Please Choose and no dropdown is there

I have installed Stock by Attributes Combined Module installed as well.

Any idea how to fix it