You may have heard of a little something called Construct 3.
Curiously it is kind of taking all Scirra's time lately.
So they focus on specific parts of the forums, when they can.
Store issues are treated quicker when dealt via mail to the support.
Otherwise, have you checked in your seller account in the "Promotional settings" of your item ?
Can you modify the availability in bundle there ?
[Edit]Oh I see, sounds like this is the issue. Yes, send a mail, this is strange and could be checked quicker this way.
Even clicking the "Remove from sale" button does not work ?[/edit]