Installed 39-253L - larger arm falls out of rail piece

A handy person from usa says:
Hi Swisco

Was happy to install the new operator and it was simple enough. However it looks like after a couple rotations, the larger arm just falls out of the track piece. I noticed it's usually when I'm turning the handle to close. I can put it back in, and it fits snugly, but it'll eventually fall out again.

Do you need to use glue or anything? Why would it be doing this?
User submitted photo of their window hardware.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
Looks like the original track slider bracket has worn out. I would consider replacing it with our 39-529, just make sure that's the right style.
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