Security error in PluginOps Landing Page builder contact form

Dears,

I’ve created this landing page https://myvirtualtrainer.co/landingpage/entrenadores-profesionales-atletismo/ with PluginOps Landing Page Builder in premium version. Issue is sometimes when an user fills all information (name, phone and email) it doesn’t register but shows “Sorry, security error” and it’s affecting my service. The way I fix this issue is by changing any value in landing page and that’s it (could be to add a character, move something, edir a color or similar). Attached an example of this issue. Thanks and please support me

The page I need help with: [log in to see the link]