That means there's a missing state for that sprite. The exclamation point diamond is the notorious "missing thing"(yes, it is called a THING. that's what a lot of objects are called in srb2). I'm not sure how you could go about fixing it, however—and I'm sorry about that—I'm just kinda here to tell you what it is/might be.
I don't think you freeslotted it. You need to directly tell the game, in a script, to freeslot new states and sprites. Otherwise, what you are describing will happen. https://wiki.srb2.org/wiki/Freeslot
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