If they claim your video (content ID match), then they have the option to monetize it (for themselves), to block the video (in some or all countries), or to issue a copyright strike.
If they choose to block in all countries or to issue a copyright strike, then your account could get into bad standing.
However, if they haven't done the last two, and they have just taken the monetization on those videos for themselves, then there is no risk to your account -- they will just monetize it and take the ad revenue.