Have you ever spoken in a meeting, clearly and accurately, only to discover that your words have been used in a way that you never intentioned? often, when this happens, people will doubt themselves and their own communication ability. That is not necessarily fair.
The ones listening will often have an agenda to their listening that will mean they are only hearing those things that support their agenda. They have listened and what they have taken fits their own agenda items. This can be overcome if you know their agendas – if you do not, it is impossible.
In all communication, know your audience, but if there are unknowns, dont beat yourself up when people are listening but never hearing.