Text Box Cursor is not Visible

On typing the value in textbox and removing it, The cursor is not been placed in same textbox and when I change the OnChange behavior then the validation message is not displayed.
1 answers

 If we added any number in text box and remove it , the cursor is not in same text box and if I added 1 number then again the cursor is not showing in same text box ...I will attach the SS of that   

In 1st text box I removed number in that but cursor in not showing in same text box.