Adobe Pen Tool Glitching

Hi there, my Adobe Acrobat Reader has been doing something wrong recently, it just happened today, when I was trying to write on a document using my pen tool, right after I touched the screen with my finger to write, it immediately changed it to the select tool, and it is continuously doing this, which is really frustrating if I am trying to do my work. Can someone help me with this issue or send me some guidance steps, please?