Custom Report Only Has Limited Data

Hi all,
I created some custom reports earlier this week (they’ve had a few days to process). I created them late March 2023 but they won’t show data from 1st February 2023.

The data and metrics/dimensions I’m using all have data since we installed in October 2022 so I can’t work out why it won’t show me any data before 1st February 2023.

Can anyone help point me out what could be the problem here?

The dimension is:
Entry Page URL

Metrics are:
(Goal 1) conversions
(Goal 1) conversion rate

To note - this goal was created and has been collecting data since October 2022.

Thank you,