Hm, yes, those original 4 lines are not anywhere near a stream.. Gildar's idea is that they were found earlier in Feb/March, and the lines on this map would be a sign of that, but then were hidden in the stream in the ravine due to their extensive injuries so rumours don't spread.
By the way, is the cedar location correct on this map? If so, this would mean Zina, Rustem and Igor crossed flowing water 4 times? 2 streams on the way from the tent to the cedar and 2 back. Seems very risky, too easy to slip and get your clothes wet