I've had this issue this season where I will buy a player from the AH and place them on my active roster. At some point (seems like it happens at the end of the in game month) they are removed and placed on the reserve roster with the 14 day cooldown before I can place them back on the active roster.
This is especially annoying because now I can't put those players back on the active roster until I get home from work the next day.
Seems like if I buy a player on a day, that evening when the sims are done they get kicked off.
Today I bought Erstad and Rendon. If you look at [1], I have Erstad playing CF in the last game of the month. Then after sims are done [2], he (and Rendon who I had as a bench player) are on the reserve roster. So now I just have no substitutes for half my games tomorrow since I don't have players that are eligible to replace them.
[1]
https://steamuserimages-a.akamaihd.n...7C2A5AFDD83C3/
[2]
https://steamuserimages-a.akamaihd.n...A008A7EEDD442/