STMS:Buffer Cleanup automatically while adding transport

If  STMS buffer cleanup automatically after adding transport  and if you cannot see any TR in STMS_IMPORT screen.

 if buffer file shows as follows

#1/_TASK CLITRELESAPUSER EXL W H A I r0 C r1 0 V R G < K T t r5 umodes ASCL20130828182513000 00000PROJECT P033 A # buffer cleaned on 20160824182513

If you  find the same thing in TP log.

sol:
Please cross check that all systems in STMS Path should be on same transport group – (GROUP_SID). Change the same & redistribute it.