It is a limitation of the EQ client (amongst others). The maximum scores shown in the Skills window are hard-coded for your class/level. I did not know that you could see your actual score at the Guildmaster though. That's a good tip.
In any case, whether you see your score in the Skills window or not the actual (higher) skill value is used by the server for all computations, so it is only a "minor" visual glitch.
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