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L2J Revision 3618:
L2JDP Revision 6715:

If you transform to "Saber tooth" (for example) and use reinforcement skill "Saber Tooth Tiger Sprint" your speed is increased by 2.

If you force untransform the effect of skill is not removed.

Is this retail or is a bug?

The Saber Tooth Tiger Sprint skill act as a buff...much like WindWalk. Buffs aren't necessarily removed because you un-transformed. In any case the skill duration is so short it does not make all that much of a difference unless you have the duration set to an extreme duration.