Help needed!

We decided it was time to update our vaccination certificate templates to include our new letterhead and alter some of the formatting.

We did so using the previous template by editing it using word, we changed the header and footer, reworded a few sentences and altered the layout slightly (centered some text). Now it is not picking up any of the patient details at all. We tried reverting back to our old template and now this won't work either. 

At no stage did we alter any of the text involving the patient details etc 

How can we resolve this problem and be able to alter and update other patient forms in the future without making them stop working?

Many thanks!

Casey