Roof Rails flex under load-Cause for concern?

Added some aftermarket crossbars to my 19 crosstrek (Brightlines from amazon ), and then mounted a Rocky Mounts Tomahawk rack to it.

I am concerned that after mounting a bike into the rack i can see the crossbars flexing as I pull on the bike.

Worried this is a safety issue and that the bars will crack under load when driving.

Am I just being paranoid?