After submitting a revised manuscript (moderate revision was requested), what are the steps followed?
You may ask the editor in charge. I.e., send an email to the editor in charge of your manuscript. If you don't know who that is, send an email to the Managing Editor.

However, I don't think there's anything to worry about in this case: the change in status doesn't mean it is going to be rejected. It simply means they got your revision and now (sub-)reviewing it again.