1) Probably because those comments were against the
imgflip.com/terms
2) Sitewide moderators can see each other's actions. I didn't do an exhaustive analysis, but looks to me like at least 3 sitewide moderators have deleted one or more of ~your~ comments at some point.
3) Since mid-July 2020, comments deleted by sitewide moderators produce a notification to the subject user with any text that was deleted. That function is intended to provide feedback to the user, i.e. what not to put in comments.
4) If your main account doesn't like comment timers, don't make comments that break the rules. Maybe reread the rules and your notifications, then go through ~your~ comment history. Might be good if ~you~ delete stuff that's against the rules in your main account so we don't have to, if and when we find those.
Lastly, please consider sending some constructive feedback to Imgflip on what changes you would like to see for the site, how you would like to see the site improve
imgflip.com/feedback
or posting those in
imgflip.com/m/imgflip
Thanks!