You have received a @GrumpyCat flag because you or someone else sent money to buy votes from an irresponsible non-GrumpyCompliant service.
Some bots are acting irresponsibly by selling votes on posts very close to final payout. These votes are sneaky, not promotion and are most of the time placed on low value content.
Sending money to these bots is also financially supporting for-profit only posters (spammers).
To know what voting bot to use, refer to https://steembottracker.com/ and use those that have 3.5 day or less in the "Max Age" column.
@sneaky-ninja (by @michaeldavid) is reporting 6 day but is actually selling votes up until 6.4 days.
Important warning, since @sneaky-ninja has made no effort to comply in 3 months, it's vote will still be countered even should he improve his Max Age setting.