Button's first click only getting focus and not triggering microflow.  

Button's first click only getting focus and not triggering microflow.  

A page with a text field and a button. Button click runs a microflow that validates the text field. When the microflow returns a validation feedback a message appears under the text field.

So far all ok. Now paste something in the textbox and use mouse to click the button once. The feedback message goes away. But the button only gets a focus and does not click nor it triggers microflow at all. I need to click on the button again to trigger microflow.  Mx version 6.10.2.