1. Low-quality printing: The signature itself may be genuine, but if you use a low-quality printer or paper, it will make the signature look blurred.
2. Image scaling: If the signature is copied and pasted from an electronic document or picture without scaling, the signature may be stretched or deformed.
3. Fake and shoddy: The last possibility is that the signature itself is a fake and shoddy product, that is, the signature is made by a person or organization to deceive others into thinking it is a real signature.
Please note that these are only some of the reasons that may lead to false signatures. To understand why the signature looks fake in some cases, please provide more details.