Shoutbox

I recently installed Messenger Plus! (together with stuffplug-ng) on my PC and now it sends messages in a very strange way. it copies every letter 4 or 5 times so that an original message:

e.g.: how are you?

looks like this when I sent it:

hhhhoooowwww    aaaarrrreeee    yyyyoooouuuu????

It's very anoying to me, but especially to the recipients. Can anybody tell me what to do about it?

thnx,

Rubèn