Random Mame Rom Not Working In RL, Even Though it Does in Mame?

[SparklePig78]

I have a rom that works in Mame (NFL Blitz '99), but it doesn't in RL. It requires the blitz 99 chd. I have my chd folder, that contains the chd, set up as a rom path in RL. Other versions of nfl blitz, which also require chd's from the chd folder, work fine in RL. The exact name of the rom that doesn't work is blitz99 btw. Why would that one rom not be working in RL? It says initializing then disappears.