In Adobe Reader 10.1.4 my signatures are valid, in version 11.0.10 they are not?

I have a PDF document with two signatures.
If I open it in Adobe Reader 10.1.4 the signatures are ok.
If I open the same document in Adobe Reader 11.0.10 the first signature is marked invalid: "Document has been altered or corrupted since it was signed".
Does anybody understand why this is?
I have the feeling this is a bug in Adobe Reader 11.
Thanks,
Corné
You can find the PDF here: WeTransfer

Can you please try repairing the application from the Control Panel.
Also, could you please let me know if this issue was happening with Reader 10.1.3 as well.

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