This is an accepted solution.
sorry for any issue can you please share store url.
thank you very much sir but for security reasons I cannot share my website if you can help me other than that I will be very happy sir ;
I'm using the debutify 305 theme. On the cart page, when a user changes the quantity, the button payment disappears, and the page needs to be reloaded in order for it to reappear.
if you have URL & front end password is confidential so please to a personal message as you like.
i have message private please check