Annotated comments types stuff blinks appear and disappear in the recording

Hi, 

Zoom, which I have used for more than 5 years is letting me down over the last couple of months with so many issues - it is unbelievable. Now, when I annotate, when I look at the recording, it blicks, appears and disappear - disorienting my students. 

I am unclear why this is happening among other so many changes - can someone please tell me why annotated types of text blink and appear and then disappear - worst, I did not even know until my students told me!