we can't spot every out of size signature as soon as it happens, at this exact moment for example, there are over 900 logged in members, we can't physically check every single one of their signatures therefore it might be a month or so before it is spotted, it is nothing personal as Hayley said.
If you use this https://babyandbump.momtastic.com/forum-help-testing-area/15884-signature-rules-tips-options.html for reference when resetting your signature you shouldn't have any more issues, this is a visual box that shows the exact maximum size your signature can be
HTH