Anki is creating two cards after I just added one?

I added a new template which I like very much but now Anki always creates two cards even though I only created one - so it’s all duplicated, what can this be and what do I do about it?

It could be that your template is causing the duplication. Could you please copy and paste its content here?

Probably you have more than 1 card type for that note type:

Edit > Cards > Card Type

In that case, use Options > Remove Card Type top delete the one you don’t want (make sure you make a manual backup of your collection beforehand, just in case)