If it's autosplitting for some missions and not for others, try going to Edit Layout into either Subsplits or Splits. From there, you can change your timer accuracy to seconds. Some pc's struggle with livesplit so this could help with your problem.

The Simpsons: Hit & Run

my autosplitter doesnt work. help

Asapasa

Grand Theft Auto: San Andreas

Grand Theft Auto V

Hitman: Contracts

Fireboy and Watergirl 1 - The Forest Temple

Stardew Valley

Grand Theft Auto Category Extensions

The Simpsons: Hit & Run - Category Extensions

Cuphead

Celeste

Pikuniku

ROBLOX: Super Golf

Pichon

Chess.com

Pikuniku Category Extensions

Lake