Laravel adding new record in database automatically

I have two tables tableA and tableB. The tableA has many relation with tableB. So when I make ajax request from frontend which is build in vuejs. This code has been executed on backend

if (!$object instanceof TableA) { $object = $this->getById($object); }

    $object->title = strip_tags($request->title);
    $object->description = strip_tags($request->description);
    $object->gender = $request->gender;
    $object->age_range_id = $request->age_range;

    $object->user_id = $request->user()->id;
    $object->status = TableA::STATUS_PENDING;
    $object->deadline = now()->addMinutes(Config::getDeadlineMinutes());

    if ($request->time != null && $request->time != 'null') {
        $object->time = $request->time;
    }
    if ($object->save()) {
        if ($request->event_types) {
            $object->types()->sync($request->event_types);
        }
        if ($request->outfit_styles) {
            $object->styles()->sync($request->outfit_styles);
        }
        if ($request->dress_code != null && $request->dress_code != 'null') {
            $object->codes()->sync([$request->dress_code]);
        }

        /** @var User $user */
        $user = $request->user();
        // If user outfit is 2 (allow next outfit)
        if ($user->add_outfit_status == User::ADD_STATUS_ALLOW_NEXT) {
            $user->add_outfit_status = User::ADD_STATUS_NEUTRAL;
            $user->save();
        }
    }

This is the code in repository. When $object->save(); is called it automatically creates a new record in tableB. The record has some random values in it. The function to store values in tableB is different and I dd before that and still the $object->save(); creates 2 - 3 records in the database with relation to tableA. So my question is why this is happening and how I can solve that ?