Ann: STX: West Erregulla Update, page-42

Might the delays and technical hitches spooked the market.
WGO is less able to cover cost blow-out because it raised just enough to cover the next to well and the SPP was a flop. This might raise the risk of a CR in the next six months.
Strike have their line of credit, so this is less of a risk for them. (more of a risk if things become A LOT more expensive, but no sign of that yet).
Maybe that explains the poor performance relative to STX?
If so, once we reach total depth (without any more hiccups) you might expect the gap to close again.