When invis my char movement is as if drunk

[Tru]

I'm having issues when my monk and druid (all my char's) are invis via player spell. Movement is as if drunk or sliding on ice, very jerky, sliding left and right as i move and movement is so uncertain I have almost fallen off cliffs etc. It happens most but not all the time. I have def. confirmed with second char that it happens on not just the one player char. I have been playing a few weeks. Thanks for help. My main is Padmalotus (monk) and secondary is Eschew (druid). Any help is appreciated. Thanks again.