Not really. A small amount of time can have a big difference. His first two were sold with a tax of 100%, so that's normal. It is a good thing you reported this because the minimal sale price of $1000 should have been awarded, so I fixed that retroactively for all affected players, including his.
If you ask how come the other players have a lower tax percentage, it is because the number of transfers in the last season at the moment of putting the first two on transfer market was different. Maybe he had a large number of transfer exactly one season before that and it affected these two while it is not affecting the other two. As you can see, in cases where tax rate is so high, a couple of days can mean a huge difference. The two players you mentioned having 68% tax (100% - 32%) already dropped to 58%.