How can I stop my new bamboo flooring from buckling up on me ? tonge and groove ,mastic glue down on concrete.

I followed manufactures instructions , cleaned concrete floor pryer to installing. opened boxes, stacked criss cross, waited two day for flooring to adjust to room temp. trowel down with mastic glue. checked floor for leveling (o.k.) Should I have left room for expantion between the tounge and grooves ?