Acrobat removed data from PDF and states that one signature is invalid

PDF forms can lose the data in a form field. To prevent this from happening:

1. Save the PDF you receive to your computer. Don't open it a browser because they are not PDF-compliant software.
2. Open the PDF in Acrobat (or another brand of PDF reading software).
3. Fill in the form fields, and save the completed form.
4. Send that final PDF.

when I try and open it with Adobe it removes all data that is entered and states that one of the signatures is invalid.

This sounds like an error in the PDF which Adobe Acrobat recognized at load time and tried to fix.
For an actual analysis an example PDF is needed.

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The data is fine when looking at it on a browser but I need to save it to our data management software as an Adobe file format.

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Then you shouldn't use PDF. After all, PDF has been an ISO format since 2008... 😉