multiAVCHD shows only External subtitle after rendering the rest not show.

[JackyWang]

I have one problem please help me.

my original MKV has 13 subtitles stream once I imported to multiAVCHD I removed 10 of the subtitles I don't want and I added my own External subtitle but once I completed rendering the project I see only my External subtitle that I added and the rest it available for select also but it won't comes out on the screen at all.

Any idea how to fix this?

Thanks.