left 4 dead startup picture appears when loading gmod

[EddieLTU]

well i was testing my map, and when i was loading gmod, i saw left 4 dead loading screen picture, but it lasts a second or less
so can someone explain what's happening?

[Vasey105]

Same happens to me but with the Day of Defeat image.

[gooooooooooogle]

steampipe games are not comatible with garry's mod