There is a very good explanation regarding Eastern Star Gas in the "most popular posts" today when you go into Hot Copper.
A very accurate description of what occurred when Biota dropped from above $3-00 to $2-00 in December- January and in the period since ranging between $2-00 and $2-25.
The only consolation is that it has found extremely strong support at the 200d Moving Average at $2-00 and more recently around $2-13.
The safest approach is to look at the closes and ignore the intraday 'shenanigans".