I paid my rent on time and in full, but my landlord posted a 3 day notice to pay rent or quit, should I be worried?
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You should contact the landlord and explain that you paid the rent in full and find out why they posted the notice. It sounds like there might be some type mis-communication or error. Perhaps they misfiled your check, or it was lost in the mail or something. It is best to communicate with the landlord rather than ignore the notice.