Some blips are red
If some blips are red, is probably because one of your other scripts has a file named minimap.gfx
Delete that file and restart the server
Blips are flashing
If the blips on the map are flashing, it's because you have more than 99 blips
Unfortunately GTA 5 doesn't support more than 99 blips, so the only way to fix it is reducing the blips count
Note: If you give to more blips the same name and the same sprite, they will group together