when anything is typed in the big text box,, you see all the text start multiplying them selves

question submit form, after the title, in the  big textbox section, any character when type any text on it with my mobile phone and delete a text from the previous i typed all the character begins to automatically multiply them selves
its very fraustrating, and alot of people are  complaing about it, please help its urgent!, link here https://zeebroad.com/make-a-post/

use yr mobile device, type in the big text box, delete your previous text, you see all the text start multiplying them selves
please help, thanks