Create PDF with signature

Dear, I need help with the following.
From the app that I developed, I generated a workflow that sends an email and generates and attaches a pdf with data registered from the app, one of the data is the signature of each of the people who attended a training.

As you can see in the following image, in some cases the signature in the report is perfect in the created PDF, but not in other cases.

Can you please guide me to solve this problem?

From already thank you very much!

this is the template that I am using.

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