Well, I can only suggest to notify this problem to the dev team behind this app. Maybe they can fix it. But, if you need some alternatives, I can give you 2: XMP Mod Player and ZXTune.
The downside for XMP Mod Player is that it can crash (no screen freeze, just refuses to play the module) when you pause a module it's currently playing and start a new one.
But the good thing is it still supports .mptm files (albeit with or without full support), just not officially declared by the dev. It also supports 64 channels, so there's little to no restriction of what file you want it to play...well...except for .mp3.
ZXTune has a good UI, just that putting mod files into a collective playlist is kind of tricky.
I'll leave that up to you to find it out.
However, I still can't get the Sound and Emulation settings to work. I guess I can't hear the difference between the sound of one to the other. I'm not sure if it supports 64 channels (and/or .mptm files) fully, because I've just updated it to the most recent version and it suddenly allows such files to be played.
I've tested both the XMP Mod Play and the ZXTune's compatibility with 64-channel mods with Deep In Space and Plasma Weapon, and its compatibility with .mptm files with the files of the format I can find in Mod Archive.
I'm terribly sorry if you can't load up the directory in DroidSound E.
And..uhh...my phone is running on Android 4.4.2, so the results you get could very well be the same as mine.