Hi Anthony!
Correct, that looks like your LMS is noting the multiple sessions (PT) and totaling them before completion.
The two API values indicate the time for the current attempt/session. Your LMS may interpret the total time as a sum of these or the last total attempts at successful completion. You may confirm with your LMS how these are recorded for completion.
For reference and other users:
cmi.core.total_time (CMITimespan, RO) Sum of all of the learner’s session times accumulated in the current learner attempt
cmi.core.session_time (CMITimespan, WO) Amount of time that the learner has spent in the current learner session for this SCO