@Britt_Vaughn Gaurang's suggestion is the right one but it sounds like not enough detail was given for you to set this up.
There's two different ways that you can approach this. I personally suggest the second recommendation below, but I'll give you both options so you can decide what works best for you.
1) Gaurang's suggestion, but with some added clarity
When you have a dropdown menu, the menu itself will be included in the output of your snippet. You're seeing it twice based on what Gaurang suggested because his suggestion had both the menu itself AND the join command he suggested.
If you were to put the dropdown menu inside of a note command, that would show you the menu when you use the snippet but it wouldn't be output. That would look like this:
{note}{formmenu: one; two; three; four; five; multiple=yes; name=example}{endnote}{=join(example, "BLAZE_AND")}
^^ while the preview shows this twice, if you were to use this snippet it would only output the text once since the first version, the menu, is inside that note command.
2) use the formatter setting in your menu
This is essentially the same thing, but rather than separating it into two parts it combines them into a single item.
{formmenu: one; two; three; four; five; multiple=yes; name=example; formatter=items -> join(items, "BLAZE_AND")}
^^ here, you can re-use my example by just replacing the menu options (one; two; three, etc...) with whatever options you want.
Let me know if this wasn't clear. If it'd be helpful to you to talk this through live, feel free to reach out to me at andrew@blaze.today to set up some time with me, too.