Should of won the hand!

i was playing omaha freeroll and have checked and checked this hand and am 100% sure i should have won #103477666

it says my opponent ‘stump’ won with 4-8 straight (which was on the board) and I had a straight 5-9!!! please check this out because this cost me winning chips in the tournament !!

Not really, sorry. Omaha !

You HAVE to use 2 of your card from hand. Its a common misstake. So, even you have 9 in hand, you needed one more , 5 or 6 or 7 or 8 in your own hand.

ONLY 3 card you can use from community cards, not all.

Here is the help, please read it up.