Correct words marked as Incorrect in Sticky Notes.

I am a regular user of Adobe Acrobat Reader. I am facing one isue since 2-3 months. When I write something in the sticky note, the system just marks the word incorrect underlined with a red line even if the word is correct. It's so much annoying during the spell check because instead of correcting the wrong words, I just spend time Ignoring the correct words.

Kindly help.