Start date delayed, sanity check? (fresh college grad)

Hey, kinda just wanted to get some validation or correction on my thoughts about what this could mean and whether I should be chilling or looking for other opportunities.

This position is with the cybersecurity division of a large "professional services" firm (accounting, advisory, etc). I interned with them during my bachelors and at the end of my internship they extended an full-time offer for after I graduated. Originally the start date was November (graduated in May). Just got called …

accounting advisory check college cybersecurity etc hey large opportunities professional services services start thoughts validation