Part 107 UAS pilot reported multiple students exceeding the LAANC approved altitude ceiling during a training mission. The UAS pilot took control and returned the UAS to the appropriate altitude each time.

Narrative

The purpose of flight was to train employees in using Unmanned aircraft to identify mosquito habitat to assist in eradication.I was training employees of County Public Health on Basic UAS flying with my DJI Phantom 4 pro. The area flown was at Location A. I obtained a standard weather brief over the phone with FSS and and an authorization of 50 feet AGL using the LAANC system through ALOFT. I gave a preflight briefing to the employees especially emphasizing the 50 foot altitude restrictions. We performed some basic maneuvers in the morning session. Then in the second session after XA00 a few of the students exceeded 50 feet AGL I think the maximum was 86 feet and I took the controls back and corrected; It seemed some were confusing left stick vs right stick and we were practicing using the telemetry to orientate the drone back towards the home point when disoriented. VLOS was maintained while we practiced this. Furthermore I was having trouble setting maximum altitude on the drone. Whenever I tried to set it for 15 meters; the software kept resetting to 45 meters. after several attempts with no success to reset; I advised the employees to use the telemetry to monitor their altitude. At postflight; after XD00 pm; we discussed that we should use a different facility within at least a two hundred grid to practice in and set maximum altitude to 100 feet to insure a safe buffer.