Poker system is broken and and cheated me more than once

Ive played multiple poker apps, and never have I been cheated so badly that than in express poker. In one round alone I had a three of a kind with 5s and lost to someone who had two pairs on being jacks and the other being 3s! How dose three of a kind loose to two pairs its not even a possibility to win in that situation and then on top of that in the same match I lost again with a pair of Aces to someone elses pair of 8s

Grotto agin about ClubWPT Express Poker