I noticed it and edited it out before the challenge closed. When you upload your artwork there is a box "submit to weelky challenge". You did that with more than one artwork. Only you can do it (and mods can edit it after). No worries, nothing bad happened :) I'm just asking you to watch for it in the future.

but I didn't submit it to the weekly challenge, at least not that I intended to.

Please don't check "Submit to weekly challenge" when your artwork do not follow the weekly challenge rules. If you want to participate in a challenge, please read  the rules of the week first and prepare an appropriate artwork.