Hi @agencia221b
The number field is designed only to allow numbers, and in my tests I cannot type any other characters into this field type.
The quick fix for your issue would be enabling javascript validation as shown here: https://formidableforms.com/knowledgebase/general-form-settings/#kb-validate-this-form-with-javascript
That said, I suspect your issues are deeper, and there may be a conflict on your site that is impacting the basic functionality of the number field.
To help diagnose the issue and determine if anything on your site is interfering with Formidable, we recommend following the steps in this guide: https://formidableforms.com/knowledgebase/what-plugins-are-known-to-cause-conflicts/#kb-how-to-find-a-conflict
We understand that testing like this on a live site can be challenging, so we suggest creating a copy of your site (a staging site) and performing the testing on that. You can create a staging site by copying your site using free plugins like All in One WP Migration or Duplicator, or by asking your host to create a staging site for you.
If you have any questions about this or need further assistance, please don’t hesitate to ask. We’re here to help.
Best regards,
Nathanael.