You might want to try tightening the toilet flange bolts. Pop the caps off and tighten one side slightly, then the other. Keep going back and forth, tightening one side then the other. Caution, don't over tighten, you could crack the toilet.
My toliet bowl is really loose an isn't flushing right we bought Oatey plumber's putty caulking and sealing compound would this work to keep it from moving?
You might ask for some toilet shims before you do any caulking. They are plastic shims you stick under the bowl and then break off when the bowl feels solid. Otherwise, you may need to remove the toilet and replace the wax gasket underneath. Once the shims are in, then do your caulking. It won't move anymore.
