BUG Height just keeps increasing at loop point. SITL Linux

BUG Height just keeps increasing at loop point. SITL Linux Ubuntu 18.10

I create a VTOL Mission just Vtol takeoff to a height 250 ft increase 25 ft to 400ft in a circle then back down to 250 ft by 25 ft incriments in waypoints.

The vtol plane takes off hits all the waypoints I drew then it hit loop I right clicked after drawing the map and mission loop. that closed the loop so it stops and keeps gaining atlitude at loop wp with alt 0.