Oddly changing file sizes in R50

[Anonymous]

For this question, I'm using a 16mm f2.8 Canon RF lens on a Canon R50 body. My image size and format is set to the largest jpeg setting.

I've noticed that when I use the A+ (full auto) mode with this setup and these settings, my file sizes range from 6.99 Mb to around 10 Mb. However, when I switch to M (Manual), my file sizes shrink down to 4 Mb or less.

Can anyone share why this is happening and if there is a way to prevent it, other than just shooting everything in C-RAW all the time?

 

[Anonymous]

Image size increases with increasing ISO. CRAW files go from about 16 MB at ISO 100 to 21 MB at ISO 3200. JPGs will be smaller but have the same trend.