Glad you asked this question. I didn’t know you (English speakers) too face it. I thought it was my incompetent English skills and lack of clear communication all the time. But then, staying here with Englishy flutherers, you can see my (little) improved English version now. It’s not that significant if you compare mine with yours, but my contemporary skills with my earlier skills. Having said that, I understand I still have a long way to go.
And I become more aware of it when I ask students questions and they don’t seem to understand. I figured out it’s not always students’ inability to understand but my inability to state it clearly.