I tried everyting, purged cache many times but still no. my website is : tibbiguncel.com
Seems like you’re not using Cloudflare nameservers anymore 
Since you’re using WordPress, may I ask if you’ve used Cloudflare APO or not?
May I ask you to check out what option have you got selected by navigating to the Cloudflare dashboard → Caching → Configuration → find section “Browser Cache TTL” and make sure the selected option from the dropdown menu is “Respect Existing Headers”.
Furthermore, from the same menu, click on the blue button saying “Purge Everything” to flush the cache at Cloudflare Edge, just in case.
Wait for a minute or two.
Refresh a page in your Web browser, otherwise try clearing your Web browser cache or use a different Web browser to test out again.
May I ask have you tried using a different Web browser, or tried clearing your Web browser cache?
How about using a Private window (Incognito mode) or a VPN connection if possible?
Is it the same behaviour on your mobile phone (4G LTE, mobile data, cellular)?