The location of the mounting bracket for awning is at the floor level where you have the
2x3 wood stud to support your floor inside. The 4th picture down from flat Matt pic you will see stud at floor level.
Either they missed the stud or hit in between the floor and stud or just over turned the bolt and stripped the wood out of hole bolt is in.
I would just try a larger thread bolt or use something like large tooth picks and glued in existing holes to fill them and just use your same bolts to tighten the bracket.
May want to use some sealant so water does not penetrate the holes.