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You can follow the following steps to fix this.
1. Go into Access your Document Templates page . in Administration → Document Templates.
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5. The Size and Position window will now pop up. In the Size tab, check that the Lock aspect ratio is unticked.
If it is ticked, simply click on the tick to unmark it.
6. Enter in 100% for both Height and Width and click OK and you will see that the Logo has adjusted accordingly.
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7. Save this amended template into your local drive and return to Administration → Document Template.Replace Replace the old template with this new template by clicking Upload a new Template.
You have now successfully resolved your Logo issues!
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