The next figure shows the initial assembly and some filled in holes on the hull bottom. Also notice that the track assemblies are not perfectly straight. Warping is common in resin kits, but can be corrected. The resin is brittle and will snap. This will set the correct shape.
Some folks use hair dryers to supply heat instead.
Note also that one track assembly is slightly longer than the other. Such asymmetry is not uncommon in resin kits, and we really just have to accept it. The reason being that the asymmetrical tracks need to be slightly adjusted to allow the model to sit flat. I generally glue one track into place, allow to set, then attach the other track. Before the glue sets, I place the model on a flat surface and line up the tracks so the model is as horizontal and stabile as possible.