Homemade go kart's front wheel bend in while driving?

For some reason when I get in my go kart and after a foot of driving the front wheels kind of buckle and tilt so that the top is facing in and the bottom is facing out (it also stops me from moving forward). I have a suspension system (consisting of pivoting axles on each individual wheel and then a shock on that). Someone told me that its doing that because it's not supported enough and another person told me that it's because the shocks are not stiff enough (and that I should use a c spanner wrench to push it up more grooves). The other weird thing is that when I pull the kart in reverse the tires go back into the right position.