I thought it would be cool to make a custom status bar in Doom, and so I made my custom images, imported them into Slade and converted them to Doom graphics, and renamed them to the old graphics. when I tried to replace the numbers that show things like armor, health, and ammo (and the tiny numbers used for the "Arms" section and the ammo display to the right end), they did not change and still used the original red doom numbers. Only the percent symbol changed, and the tiny numbers in "Arms". I thought that there might be some additional steps to replacing the old font, so I looked around for awhile and found out that I need to make a separate lump called "FONTDEFS". I did that, wrote "STATUSFONT" and everything that goes inside of it (and I double-checked that I made no spelling errors and looked the same as the one on the ZDoom Wiki), and got it to work once. I saved and exited Slade to finish working on the status bar itself, but when I opened the file again and ran the game to see how it all looks, it went back to the old doom numbers.
I did a lot of searching to figure out about the "FONTDEFS" lump, but now that this is happening I really don't know what I can do.