reddit limits your profile menus (New, Top, Hot & Controversial) to 1,000 comments each. If you have older comments that aren't popular nor controversial, then these won't appear on your profile. In particular, if you have an old Top comment, you might find it deleted but low but positive karma replies left in.
You need to do a GDPR request and feed that into shreddit (the github version, the website charges for the feature). Alternatively, you can get the Pushshift backup of all of reddit from 2022 and run a script to filter out your comments, then feed that into another script. However, shreddit uses the API, so time is limited for that option, and I've also found it panics a lot so you have to keep cutting out the comments and running it again.
Hopefully someone will make a new version that works post 1 July.