You might want to try re-importing the audio to your project and see if there was a problem with its conversion to a chrome appropriate format. If you're playing only one sound at a time, this is likely the problem.
Otherwise, the problem is probably the mobile chrome browser itself, which is notorious for its lackluster HTML5 audio support. Its known to have all sorts of problems, such as not being able to play more than 1 or 2 audio tracks at a time, and simply not playing audio tracks that are too long or too short.