A few of us are using Sideband for Android version 2.2.0 on a small private network and we've all come across the same problem.
Unless you can enter the whole message on one go without editing it usually gets a bit scrambled and the more you try to fix it the worse it gets until the only way forward is to delete and start again.
I have searched for this and not seen anything similar. Apologies if this is a known subject.
John.