visual problem on two triplets in 4/4 time

[胡海鹏 - Hu Haipeng]

Hello,
  My mother found a problem when I write continuous triplets. For example,

\time 4/4 c'4 c' \times 2/3 { c'8 d' e' } \times 2/3 { f' g' a' }

The two triplets are grouped like one sextupplet, but with two 3's. What's the problem? Is it a wrong practice in notation convention? Is it controlled by beam settings?

Regards
Haipeng

 

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