Some emails are not triggered of a campaign

Hello There,
I have encountered an issue in a campaign where some of our emails are not getting triggered.

We have a campaign that triggers 8 emails with a gap of every 5 days.
I have noticed that the last 3 emails are not getting triggered from last month whereas earlier the campaign was working fine.

What could be the possible reason for this problem?

Any errors in log?

Are those emails published?

No errors in log.

Those are published, in fact, those emails were triggered a few days back.

How many contacts are inside the campaign ?

Are you sending immediately or do you have a queue ?

What do the campaign actions show in the campaign dashboard ?