Won't let me ask on Tumblr?

[Kiyasha M]

I've seen other asks for where people can't open their own asks, but this is different. When I go onto other people's blogs and go to their ask box, after writing my message the ask button that sends it is still "unpressable." On some people's blog, I can't see the blue button at all. Does anyone know what the problem might be?
I've also installed XKit for tumblr on my account... could this be the problem??
Please help- I rp, so you may see how this is a problem
I think it might, but it won't even let me send ONE ask, so there's no way I've hit ask limit...