Chain not fitting on big chainring
Based on your photo, thats a new chain on an old chainring.

The gap between adjacent rollers in the chain is called the "pitch" and is exactly half an inch for a bicycle chain.

Your chainring's teeth have worn so they're effectively further apart than a half-inch, so the new chain cannot mesh with it for the full length.

The proper answer is to replace the big chainring, but given you've called it entry-level then there's a good chance its rivetted together, not fastened with chainring bolts like a higher-level chainset.    You may be up for a whole new crankset.

The other option is to ride it as-is.  Drawback is that your chain will wear quicker and chainring has fewer teeth in contact, so it will also wear quicker.  Eventually you'll suffer from chain slip, where you stomp on a pedal and the whole thing will spin forward potentially dumping you if not seated.

I'm guessing this is an entry level bike and you've worn out a cassette and chain on your commuting (Great work there btw)  You might be able to pick up a used crankset on ebay/etc for cheap, or consider this a sign that you're now a committed commuter and plan/budget towards the next bike, based on what you know.