Kitchen sink won't drain properly after re-installation of garbage disposal?

My dad recently took out the garbage disposal to fix it and ever since re-installation, the sink has problems draining. The side without the disposal gets the most usage and can get backed up within minutes of the water running. This can sometimes be remedied by activating the disposal with a quick burst or two. Other times all it will do is cause water to come up through the disposal side. Eventually the standing water will drain.

Any ideas on what’s wrong?

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