Look at this configuration:
CfgWeapons → "arifle_MSBS65_GL_F" → "FullAuto" → "StandardSound" → "soundSetShot"
for SilencedSound sound set is correct (_Auto_ prefix) but StandardSound use sound set for semi auto although there is a special one (_Auto_ prefix too)
So needs to change from Msbs65_01_Shot_SoundSet to Msbs65_01_Shot_Auto_SoundSet in P:\a3\sounds_f_enoch\config.cpp line 4045

By the way Mx_Tail_Contact_SoundSet is not exist (platform), so can be issue too