Problem with 404 error

The plugin works fine on two of my websites. But on a new webstie, there’s an error. The new website is made different, in two terms: 1) It uses Polylang for 2 language versions 2) It is updated to WordPress 5.0 (uses Gutenberg) Everything else is the same – theme, hosting, other used plugins etc. The new site gets an error in traffic analysis. Site works, but when veiwing traffic the error is shown. Also, the captcha for login and contact form is not shown/loaded. Here’s the code: Request URL: https://www.ivetamakeup.com/wp-content/plugins/contact-form-plugin/css/form_style.css?ver=4.1.0 Request Method: GET Status Code: 409 Remote Address: 192.185.128.202:443 Referrer Policy: no-referrer-when-downgrade content-length: 83 content-type: text/html; charset=iso-8859-1 date: Tue, 11 Dec 2018 10:33:17 GMT server: nginx/1.14.1 status: 409 :authority: http://www.ivetamakeup.com :method: GET :path: /wp-content/plugins/contact-form-plugin/css/form_style.css?ver=4.1.0 :scheme: https accept: text/css,*/*;q=0.1 accept-encoding: gzip, deflate, br accept-language: en-GB,en;q=0.9,en-US;q=0.8,sr;q=0.7,bs;q=0.6 cookie: PHPSESSID=od4jti0qic2h8vj90bb2k5ma27; _ga=GA1.2.762905627.1544520644; _gid=GA1.2.461326704.1544520644; pll_language=sr referer: https://www.ivetamakeup.com/ user-agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36 Is there a way to fix it – or at least know what causes it? The page I need help with: [ log in to see the link] Update: Functionality seems to be fine, just the css error still worries me. Tested another comment plugin – it also does it with gutenberg and polylang. Update: The problem seems to be fixed with todays plugin update – tried it just now. 🙂 Thank you, great job on the plugin.