DHIS 2.30 is displaying some icons and buttons with corrupted characters

I have installed DHIS2 2.30 on tomcat 9 with PostgreSQL. I have a problem with the display.

For example, when I go to ‘Maintenance’, the button for ‘Add’ and ‘List’ are not showing right. They are showing corrupted characters. The same thing is happening on that page with the ‘Metadata group editor’ icon at the top right.

When I go to the demo site, the display is correct. How can I fix this?

enter image description here