First suggestion: use a symmetry. The software will work the half. But this not should be the problem.
Are the two pieces sliding over the bar? This could be the problem.
In other words, are three parts ( not fixed: problem) or just one part?
Upload the file will be another option to get a fast answer.
You didn't restrain the model properly. Either you have added no contacts between the parts. In case you have used a no-penetration contact, adding a friction coefficient will help.
restrain the end completely (fully fixed) and give global contact as bonded
Are you using contact sets? If so, are they set up properly?
There is no need for symmetry for so simple a model and obviously so few elements. It visually appears as if your constraints and loads are all correct (fully fixed ends and forces on the two clips).
One thing I have seen is that global bonding doesn't always bond globally. Try searching for contact sets and accept the two that will show up as "bonded".
If that doesn't work, throw out the model and start fresh, since it is such a simple assembly.
The only other thing that springs to mind it that perhaps your clips are rotating and you might have to place a directional fixture on some part of them.
Post a pic of your set-up window and the run properties if none of the above work.