Why does this only execute twice?

The Aim is int 100.
But it counts up to 2 and then resets.
Why

PHP:

if($event->getBlock() instanceof Stone) {
                            if (!$fortschritt >= $aim) {
                                $cfg->set($player->getName()."-fortschritt", $fortschritt + 1);

                                $player->sendPopup("§aQuest Fortschritt erzielt!");
                                $cfg->save();
                            } else {
                                $cfg->remove($player->getName()."-aim");
                                $cfg->remove($player->getName()."-fortschritt");
                                $this->getLogger()->info("Removed config für ".$player->getName()." Grund: Quest Beedendet Ziel: Quest Vars (OnlyInQuest)");
                                $player->sendPopup("§l§aQuest Geschafft (50 Quest-XP)");
                                $xp = $cfg->get($player->getName() . "-XP");
                                $cfg->set($player->getName() . "-XP", $xp + 50);
                                $cfg->save();


                            }
                        }
                    break;