No, it wasn't.
Some examples are MI0LLG, VA3HP, K4GHS
Excerpt from the log file:
2018-03-04,20:36:45,2018-03-04,20:37:45,MI0LLG,IO65,14.075858,FT8,-05,-04,,,
<== First time
2018-03-12,19:14:45,2018-03-12,19:16:15,MI0LLG,IO65,14.075369,FT8,-06,-09,,,
<== Duplicate 'cause I didn't realize I worked him before
2018-03-12,13:54:45,2018-03-12,13:55:45,VA3HP,EN92,7.076022,FT8,-17,-11,,,
2018-03-12,17:48:30,2018-03-12,17:49:30,VA3HP,EN92,7.075005,FT8,-01,+07,,,
2018-03-12,13:49:15,2018-03-12,13:50:15,K4GHS,EM96,7.076104,FT8,+02,-02,,,
2018-03-12,17:42:15,2018-03-12,17:43:45,K4GHS,,7.075521,FT8,-16,-08,,,
<== Just noticed that Grid is missing. Could that be a factor?