I presume you are using the wysiwyg mode when you encounter the link problem? Maybe something there is broken. I never use it, so personally I haven't noticed. When you next time see it, maybe you could switch to the plain tagged mode and see how it looks like (the tags, that is).

I use Opera Mini or Nokia's own browser on my cellphone to browse Gotwoot, but I have probably only made so simple posts that I wouldn't see your mobile troubles.