Topeak Journey help

Hi all,

My girlfriend and I want to go bikepacking using the Topeak Journey trailer. It can carry a lot of weight and makes it possible for me to carry all the load and she can just enjoy the cycling (she just started cycling).

We bought a second hand Topeak Journey and ordered a compatible thru axle for my Giant TCR. However, there seems to be a compatibility issue. Or rather: the Topeak 'frame' seems to be to narrow for the axle to fit.

With a lot of force, we are able to eventually fit it, but after removing the frame from the axle, the frame instantly bows back to the narrow position as seen on the pictures.

Anyone here with the same experience or advice?

Thank you in advance!