Your server responds with the following security headers:
strict-transport-security: max-age=63072000; includeSubDomains; preload
referrer-policy: no-referrer-when-downgrade
accept-ranges: none
content-security-policy: default-src 'self' https://www.gstatic.com https://*.bugherd.com https://*.bugherd.com https://bugherd-attachments.s3.amazonaws.com; font-src 'self' data: https://fonts.googleapis.com https://fonts.googleapis.com https://fonts.gstatic.com https://fonts.gstatic.com https://*.bugherd.com https://*.bugherd.com; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com https://fonts.googleapis.com https://*.google.com https://tagmanager.google.com https://*.bugherd.com https://*.bugherd.com; child-src 'self' https://www.youtube.com https://www.youtube.com https://www.gstatic.com https://*.google.com https://www.googletagmanager.com https://*.facebook.com; img-src 'self' data: *; media-src 'self' *; script-src 'self' 'unsafe-eval' 'unsafe-inline' https://www.google-analytics.com https://www.google-analytics.com https://www.googletagmanager.com https://*.googleapis.com https://*.googleapis.com https://*.google.com https://*.google.com https://maps.gstatic.com https://maps.gstatic.com https://www.gstatic.com https://*.bugherd.com https://*.bugherd.com https://www.youtube.com https://s.ytimg.com https://*.cloudflare.com https://*.facebook.net
x-content-type-options: nosniff
x-frame-options: SAMEORIGIN
x-xss-protection: 1; mode=block
notably:
x-frame-options: SAMEORIGIN
See: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options
Those headers are set by
a) security plugin
b) manually in .htaccess
c) webserver configuration file