incompatibility with Text Utilities about modernui

[BloCamLimb]

I didn't see anything wrong.

The color button has the character U+2B1B '⬛' which is an emoji character (and default to emoji style), then it's rendered as a color emoji using Google Noto Color Emoji. If you want it to render to text style, you may either disable Color Emoji, or append U+FE0E 'VS-15' character, like '⬛︎'. See also https://emojiterra.com/black-large-square/.

The bold style for Minecraft bitmap fonts is deprecated by Modern Text Engine, due to its low performance and bad looking. You could, alternatively, select an outline font (TrueType/OpenType) and abandon those bitmap fonts. You will find Default Font Behavior preference.

It seems that the text shadow is not working. I assume you disabled Allow Shadow.

[peow]

disabling Color Emoji solved the color issue
I'm trying to find a font that suits Minecraft but I'm having trouble, most are too soft for a cubic game, I'm trying to find a free font that can be used in a modpack

[peow]

how do i solve this overlap in item name?

[BloCamLimb]

This is because the tooltip mod you are using assumes that the space has a fixed width of 4. But the width of space varies in different fonts. In your case, space becomes narrower, so more spaces are needed to provide sufficient indentation. You can take a look at this issue and report it to the tooltip mod author
wisp-forest/numismatic-overhaul#108 (comment)