When recording samples sound low and also when cut crossfading

When I am playing a recorded mix the parts of the mix when I use a sample don’t sound as loud as the song playing. The sample is drowned out by the song that is playing. This is also happening when I cut crossfade to the song I am cueing. When I crossfade to the cued song it sounds fine but when I cut crossfade for lets say 30 seconds the main song playing is drowning out the cued song.

I don’t understand why it’s doing that because all the volumes are up, including the master volume. Please some help.