Welcome to the ODK forum, @Cristian_Ceballos_Ro! We're glad you're here. When you get a chance, please introduce yourself on this forum thread. I'd also encourage you to add a picture as your avatar because it helps build community!
I'm sorry to hear that you are having this issue! Could you please provide some more details...
- May you share your XLSForm file(s) here?
- What version of ODK Collect are you using?
- What is the device you are using (phone model and Android version)?