I have problems being understood sometimes. In fact, two of my college professors recognized this very quickly. They both (independently) told me that I understood more than I was able to communicate. I would basically try to explain something to them, and they knew I understood it well, but what came out of my mouth was sort of gibberish. I had difficulty translating my thoughts to speech.
This usually happens when thoughts are racing through my head. I have so many things going on up there that it's hard for me to coherently explain what I want to explain. I think it's a symptom of hypo/mania for me.
Do you have racing thoughts or anything like that? Or I might just be a weirdo