Can you applying for the same job twice after interview?

Yes, you can re-apply. You should send a cover letter. Your resume is a record of your past. Your cover letter lets you explain what you can do for the company in the future.

Does it look bad to apply to multiple jobs at the same company?

It’s very common and normal to apply for multiple positions for the same company. More than likely there will be a different HR person every time. Different HR rep, different department, different hiring managers, different interview experience, even different location. It’s perfectly normal so go for it.

Is it bad to send your resume twice?

Yes, definitely send your application/resume to the company again, but please make sure you give it a healthy amount of time before doing so. If absolutely nothing is sent your way after two weeks then go ahead, and send an application, resume, or email them again.

Does indeed automatically repost jobs?

This is totally normal. Sometimes jobs don’t get as many applicants as they were hoping for. Or maybe they aren’t getting the number of quality applicants they want. So they keep posting.