I have adjusted subs timing in the past while running a video but that will have been with Android 5 and release 1.07. I didn't notice any problems. Dropping back to that release might be a fix if subs are necessary.
Assuming you use srt subs, there are utilities that can resync the times permanently throughout the file. Subshifter is an online tool that I use frequently.
You might also try running without the wrapper.