Because the background and image are not printed, the seal is restricted by PDF, and it is automatically ignored when printing. This may be to prevent someone from stealing the red seal, so it may not be printed and needs to be printed by a color printer. The solution and specific operation steps are as follows:

1. Open the Word document on the computer and click the icon in the upper left corner, which is the Office button, as shown below.

2. Locate and click the Word option button, as shown below.

3. Find and click the "Show" option, as shown below.

4. Check the options of "Print graphics created in Word" and "Print hidden text", and finally click OK, as shown below.