I bred a TB stallion and WB mare and got a sport horse.

Is this normal?

Yes. The only way to get a WB foal is WBxWB or WB sirexTB dam. TB sirexWB dam= SH.

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Help> Game Guide, here's the link: https://horseeden.com/help.php

Interbreeding Of Breeds Horses of different breeds may breed to each other. Here is the outcome of interbreeding:

• WB = Warmblood
• TB = Thoroughbred
• SH = Sport Horse
• RID = Irish Draught Horse
• ISH = Irish Sport Horse
• KNN = Knabstrupper
• AA = Anglo Arabian
• X = Appendix Quarter Horse
• PON = Sport Pony

• WB sire X WB dam = WB foal
• TB sire X TB dam = TB foal
• WB sire X TB dam = WB foal
• TB sire X WB dam = SH foal
• SH crossed with anything except ISH = SH foal
• SH crossed with ISH = ISH foal
• RID (sire or dam) x RID = RID
• RID (sire or dam) x anything = ISH
• ISH (sire or dam) x anything = ISH
• KNN sire X KNN dam = KNN foal IF a filly has LP or a colt has LP and PATN. If a foal doesn't meet these criteria, it will be a SH
• RID or ISH sire X KNN = ISH
• KNN sire X RID or ISH dam = ISH
• KNN sire X anything not KNN, ISH, or RID = SH
• Any sire not KNN, ISH, or RID X KNN = SH
• AA sire X AA dam = AA
• Any AA x TB = AA
• X sire with X dam = X
• Any X with TB = X
• PON x Anything = PON if the foal 14.2 hands or under
• PON x Anything = SH if the foal is over 14.2 hands
• Any cross that results in a SH normally will result in a PON if the foal is 14.2 hands or under