Unable to edit scatter plot averages

Hi all,

I am trying to change the colour of the line on my scatter plot and add data labels. For some reason, I am unable to edit them and it displays them as 'off', even though they are on my chart.

I am also unable to delete the average lines or change their names - when I try they just reappear with the original name. The only way I have been able to delete averages is to reset to default.

I have cleared my PowerBI caches, checked my version (2.137.1102.0 64-bit, October 2024) and restarted my laptop. I have other scatter graphs on the same page that are functioning correctly. Please help!