LOITER_TIME map visualization on -flight plan- screen

Good evening . Hoping this is not a duplicated topic (tried to seach back I didn,t find anything recently) .
When I insert LOITER_TIME instruction after (below) WP putting only 3 (lets say) in the-time- column , leaving all the following fields to -0- (without specify Lat Lon and Alt order to maintain position of the previous WP). The planner create such LOITER instruction as WP having Lat=0 and Lon=0 real coordinates (in the Atlantic Ocean , at south of Ghana).
I think this is only a visualization bug (Mission Planner 1.3.40 ) …or not ?
Thanks a lot to anyone who replies