我的ajax php联系表单没有重定向到所需的页面

i have a contact form on my website, which ive already used before on a different site. i just copied and paste it and changed the required info. it works perfectly fine on the first site but on the second site it wont redirect to the page i want it to. the details from the contact form are being sent to my email and everything works fine on that end but wont redirect to the thank you page. i checked the syntax of one compared to the other to see if there are any differences and there are none, its seems like the processis getting stuck at the "echo" stage:i have a contact form on my website, which ive