I am writing a Tumblr theme and all went smoothly until I enabled the "ask box".
When I add the code for the ask box to my page, the box will appear on both my main page (where the posts are displayed), and also on my /ask page (which is the only page it should appear on).
I can't find anything on this issue in the tumblr documentation, and no themes I look at even have the tumblr ask box code in them.
The ask box doesn't need to be hard coded. Tumblr creates an ask page for you at '/ask' by using the permalink page style for text posts. The only thing you need to worry about coding in your theme is the ask link.
Make sure you wrap the ask link in the appropriate blocks - {block:AskEnabled} and {/block:AskEnabled}.
(All of this is the same for submit pages too. Just a slightly different block which can be found in the documentation).