Random small square anomalies occur in images

The following issue is most likely caused by a user error (aka Me), but for the life of me I cannot figure out what action I am performing to cause the subject error.  At some point small random square anomalies appear in all my edited images and such are saved with the file upon performing export operations.  See the attached edited image and zoom into the sky to see such anomalies for examples, with anomalies existing in other areas as well.  Any thoughts on what is causing these anomalies and how to resolve this issue?  Thanks ahead of time for your response.