No, this is the only entry in my transaction for Myriadcoin (which I didn't mine at all):
4954457 2015-02-20 07:40:50 (UTC) Credit Confirmed Auto Exc... 1731251 n/a 1.16457137
Jackpotcoin, which I didn't mine either has these entries:
10964533 2015-03-08 05:43:08 (UTC) Credit Confirmed Auto Exc... : 44579 n/a 437.93124497
10964513 2015-03-08 05:43:08 (UTC) Credit Confirmed Auto Exc... 1801163 n/a 111.00263373
10863515 2015-03-02 11:45:42 (UTC) Credit Confirmed Auto Exc... 1777146 n/a 1,065.87603532
10840934 2015-03-01 01:49:09 (UTC) Credit Confirmed Auto Exc... 1767118 n/a 1,973.89829648
10840929 2015-03-01 01:49:09 (UTC) Credit Confirmed Auto Exc... : 41442 n/a 1,220.77527182
Oh it's credited by auto exchange.
Did you change auto exchange target coin before?
Auto exchange coin is determined when your mined coin is about to be confirmed.
It seems like you once selected myriadcoin and one day you changed it to jackpotcoin.
What coin is set for auto exchange now?
We will check your account if there's error.
No, I selected Darkcoin as autoexchange coin (also had Bitcoin a short while), never any others.