The leg slides back on. But, during transformation the legs fall off without even touching them.
It just needs more friction on the contact points.
Like I said before, BLUE PAINTERS' TAPE will remedy this.
The dimensions of the shuttle and battroid are rather squat. The only mode that really works for this is the GERWALK mode, but even that has it's shortcomings.
If only the overall proportions were maybe a tad longer this would look fantastic and more agressive in all three modes.